{
  "schema_version": "1.0.0",
  "content_version": "1.0.0",
  "module_id": "m20",
  "title": "Seventh Chords",
  "seed": 710041,
  "preset": {
    "id": "seventh-chords-beginner",
    "difficulty": "beginner",
    "item_count": 10,
    "candidate_set": [
      "dominant7",
      "major7",
      "minor7"
    ],
    "pitch_range_midi": [
      60,
      79
    ],
    "tempo_bpm": 90,
    "meter": [
      4,
      4
    ],
    "hints": true
  },
  "purpose": "Distinguish dominant, major and minor sevenths.",
  "instructions": {
    "student": "Choose the complete seventh-chord quality as roots vary. Identify which chord member would need to change to match the other option.",
    "teacher": "Play each numbered question from this page. Use the same replay policy for all learners. Keep the answer section separate until the first response is recorded. For tapping tasks, record an observation on paper; use the online trainer for device-timed scoring.",
    "follow_up": "Apply the third-then-seventh decision to new chords without remembering their exact register."
  },
  "examples": {
    "demonstration": {
      "id": "m20-712061-0",
      "seed": 712061,
      "kind": "seventh",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 69,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 73,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "minor7",
      "explanation": "Minor seventh: root F#4, bass F#4; sounding notes F#4, A4, C#5, E5. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A4",
          "C#5",
          "E5"
        ]
      },
      "total_beats": 2
    },
    "comparison": {
      "id": "m20-712061-0",
      "seed": 712061,
      "kind": "seventh",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 73,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "dominant7",
      "explanation": "Dominant seventh: root F#4, bass F#4; sounding notes F#4, A#4, C#5, E5. Semitone offsets: 0, 4, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A#4",
          "C#5",
          "E5"
        ]
      },
      "total_beats": 2
    },
    "seed": 712061,
    "comparisonSeed": 712061
  },
  "questions": [
    {
      "id": "m20-710041-0",
      "seed": 710041,
      "kind": "seventh",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 65,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 68,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "dominant7",
      "explanation": "Dominant seventh: root C#4, bass C#4; sounding notes C#4, F4, G#4, B4. Semitone offsets: 0, 4, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F4",
          "G#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-1",
      "seed": 717960,
      "kind": "seventh",
      "events": [
        {
          "midi": 60,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 63,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "minor7",
      "explanation": "Minor seventh: root C4, bass C4; sounding notes C4, D#4, G4, A#4. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4",
          "G4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-2",
      "seed": 725879,
      "kind": "seventh",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 65,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 68,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "dominant7",
      "explanation": "Dominant seventh: root C#4, bass C#4; sounding notes C#4, F4, G#4, B4. Semitone offsets: 0, 4, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F4",
          "G#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-3",
      "seed": 733798,
      "kind": "seventh",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 73,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 77,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "major7",
      "explanation": "Major seventh: root F#4, bass F#4; sounding notes F#4, A#4, C#5, F5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A#4",
          "C#5",
          "F5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-4",
      "seed": 741717,
      "kind": "seventh",
      "events": [
        {
          "midi": 65,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 69,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 72,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "major7",
      "explanation": "Major seventh: root F4, bass F4; sounding notes F4, A4, C5, E5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A4",
          "C5",
          "E5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-5",
      "seed": 749636,
      "kind": "seventh",
      "events": [
        {
          "midi": 60,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 63,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "minor7",
      "explanation": "Minor seventh: root C4, bass C4; sounding notes C4, D#4, G4, A#4. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4",
          "G4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-6",
      "seed": 757555,
      "kind": "seventh",
      "events": [
        {
          "midi": 63,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 74,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 74,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "major7",
      "explanation": "Major seventh: root D#4, bass D#4; sounding notes D#4, G4, A#4, D5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "G4",
          "A#4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-7",
      "seed": 765474,
      "kind": "seventh",
      "events": [
        {
          "midi": 68,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 72,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 75,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 79,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 78,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 79,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 78,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "major7",
      "explanation": "Major seventh: root G#4, bass G#4; sounding notes G#4, C5, D#5, G5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G#4",
          "C5",
          "D#5",
          "G5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-8",
      "seed": 773393,
      "kind": "seventh",
      "events": [
        {
          "midi": 64,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 74,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 74,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 74,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "minor7",
      "explanation": "Minor seventh: root E4, bass E4; sounding notes E4, G4, B4, D5. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "G4",
          "B4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m20-710041-9",
      "seed": 781312,
      "kind": "seventh",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 70,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 73,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 77,
          "onset_beats": 0,
          "duration_beats": 1.7,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "dominant7",
          "label": "Dominant seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "major7",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "minor7",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 0,
              "duration_beats": 1.7,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "major7",
      "explanation": "Major seventh: root F#4, bass F#4; sounding notes F#4, A#4, C#5, F5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A#4",
          "C#5",
          "F5"
        ]
      },
      "total_beats": 2
    }
  ],
  "answer_key": [
    {
      "number": 1,
      "question_id": "m20-710041-0",
      "answer": "dominant7",
      "label": "Dominant seventh",
      "explanation": "Dominant seventh: root C#4, bass C#4; sounding notes C#4, F4, G#4, B4. Semitone offsets: 0, 4, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F4",
          "G#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 2,
      "question_id": "m20-710041-1",
      "answer": "minor7",
      "label": "Minor seventh",
      "explanation": "Minor seventh: root C4, bass C4; sounding notes C4, D#4, G4, A#4. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4",
          "G4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 3,
      "question_id": "m20-710041-2",
      "answer": "dominant7",
      "label": "Dominant seventh",
      "explanation": "Dominant seventh: root C#4, bass C#4; sounding notes C#4, F4, G#4, B4. Semitone offsets: 0, 4, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F4",
          "G#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 4,
      "question_id": "m20-710041-3",
      "answer": "major7",
      "label": "Major seventh",
      "explanation": "Major seventh: root F#4, bass F#4; sounding notes F#4, A#4, C#5, F5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A#4",
          "C#5",
          "F5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 5,
      "question_id": "m20-710041-4",
      "answer": "major7",
      "label": "Major seventh",
      "explanation": "Major seventh: root F4, bass F4; sounding notes F4, A4, C5, E5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A4",
          "C5",
          "E5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 6,
      "question_id": "m20-710041-5",
      "answer": "minor7",
      "label": "Minor seventh",
      "explanation": "Minor seventh: root C4, bass C4; sounding notes C4, D#4, G4, A#4. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4",
          "G4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 7,
      "question_id": "m20-710041-6",
      "answer": "major7",
      "label": "Major seventh",
      "explanation": "Major seventh: root D#4, bass D#4; sounding notes D#4, G4, A#4, D5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "G4",
          "A#4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 8,
      "question_id": "m20-710041-7",
      "answer": "major7",
      "label": "Major seventh",
      "explanation": "Major seventh: root G#4, bass G#4; sounding notes G#4, C5, D#5, G5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G#4",
          "C5",
          "D#5",
          "G5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 9,
      "question_id": "m20-710041-8",
      "answer": "minor7",
      "label": "Minor seventh",
      "explanation": "Minor seventh: root E4, bass E4; sounding notes E4, G4, B4, D5. Semitone offsets: 0, 3, 7, 10.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "G4",
          "B4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 10,
      "question_id": "m20-710041-9",
      "answer": "major7",
      "label": "Major seventh",
      "explanation": "Major seventh: root F#4, bass F#4; sounding notes F#4, A#4, C#5, F5. Semitone offsets: 0, 4, 7, 11.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "A#4",
          "C#5",
          "F5"
        ]
      },
      "total_beats": 2
    }
  ],
  "record": {
    "learner": "",
    "date": "",
    "first_responses": "",
    "same_question_corrections": "",
    "new_question_check": ""
  }
}