{
  "schema_version": "1.0.0",
  "content_version": "1.0.0",
  "module_id": "m15",
  "title": "Sevenths",
  "seed": 710041,
  "preset": {
    "id": "minor-major-sevenths-beginner",
    "difficulty": "beginner",
    "item_count": 10,
    "candidate_set": [
      10,
      11
    ],
    "pitch_range_midi": [
      60,
      79
    ],
    "tempo_bpm": 90,
    "meter": [
      4,
      4
    ],
    "hints": true
  },
  "purpose": "Hear minor and major sevenths near an octave.",
  "instructions": {
    "student": "Identify seventh quality across fresh roots. For descending pairs, imagine the octave below instead.",
    "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 remaining-gap idea to the new-question check without replaying the worked labels."
  },
  "examples": {
    "demonstration": {
      "id": "m15-711556-0",
      "seed": 711556,
      "kind": "interval",
      "events": [
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 77,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 78,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "10",
      "explanation": "G4 to F5: 10 semitones, ascending. Minor seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G4",
          "F5"
        ]
      },
      "total_beats": 2
    },
    "comparison": {
      "id": "m15-711556-0",
      "seed": 711556,
      "kind": "interval",
      "events": [
        {
          "midi": 67,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 78,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 78,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "G4 to F#5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G4",
          "F#5"
        ]
      },
      "total_beats": 2
    },
    "seed": 711556,
    "comparisonSeed": 711556
  },
  "questions": [
    {
      "id": "m15-710041-0",
      "seed": 710041,
      "kind": "interval",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "10",
      "explanation": "C#4 to B4: 10 semitones, ascending. Minor seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-1",
      "seed": 717960,
      "kind": "interval",
      "events": [
        {
          "midi": 60,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "C4 to B4: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-2",
      "seed": 725879,
      "kind": "interval",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 72,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "10",
      "explanation": "C#4 to B4: 10 semitones, ascending. Minor seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-3",
      "seed": 733798,
      "kind": "interval",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 77,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "F#4 to F5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "F5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-4",
      "seed": 741717,
      "kind": "interval",
      "events": [
        {
          "midi": 65,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 76,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "F4 to E5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "E5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-5",
      "seed": 749636,
      "kind": "interval",
      "events": [
        {
          "midi": 60,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 71,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 70,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 71,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "C4 to B4: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-6",
      "seed": 757555,
      "kind": "interval",
      "events": [
        {
          "midi": 63,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 74,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 73,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 74,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "D#4 to D5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-7",
      "seed": 765474,
      "kind": "interval",
      "events": [
        {
          "midi": 68,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 79,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 78,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 68,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 79,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "G#4 to G5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G#4",
          "G5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-8",
      "seed": 773393,
      "kind": "interval",
      "events": [
        {
          "midi": 64,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 75,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 74,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 75,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "E4 to D#5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "D#5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m15-710041-9",
      "seed": 781312,
      "kind": "interval",
      "events": [
        {
          "midi": 66,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 77,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "10",
          "label": "Minor seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 76,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "11",
          "label": "Major seventh",
          "events": [
            {
              "midi": 66,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 77,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "11",
      "explanation": "F#4 to F5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "F5"
        ]
      },
      "total_beats": 2
    }
  ],
  "answer_key": [
    {
      "number": 1,
      "question_id": "m15-710041-0",
      "answer": "10",
      "label": "Minor seventh",
      "explanation": "C#4 to B4: 10 semitones, ascending. Minor seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 2,
      "question_id": "m15-710041-1",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "C4 to B4: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 3,
      "question_id": "m15-710041-2",
      "answer": "10",
      "label": "Minor seventh",
      "explanation": "C#4 to B4: 10 semitones, ascending. Minor seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 4,
      "question_id": "m15-710041-3",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "F#4 to F5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "F5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 5,
      "question_id": "m15-710041-4",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "F4 to E5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "E5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 6,
      "question_id": "m15-710041-5",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "C4 to B4: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "B4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 7,
      "question_id": "m15-710041-6",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "D#4 to D5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "D5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 8,
      "question_id": "m15-710041-7",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "G#4 to G5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G#4",
          "G5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 9,
      "question_id": "m15-710041-8",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "E4 to D#5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "D#5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 10,
      "question_id": "m15-710041-9",
      "answer": "11",
      "label": "Major seventh",
      "explanation": "F#4 to F5: 11 semitones, ascending. Major seventh.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F#4",
          "F5"
        ]
      },
      "total_beats": 2
    }
  ],
  "record": {
    "learner": "",
    "date": "",
    "first_responses": "",
    "same_question_corrections": "",
    "new_question_check": ""
  }
}