{
  "schema_version": "1.0.0",
  "content_version": "1.0.0",
  "module_id": "m16",
  "title": "Mixed Intervals",
  "seed": 710041,
  "preset": {
    "id": "mixed-intervals-beginner",
    "difficulty": "beginner",
    "item_count": 10,
    "candidate_set": [
      2,
      3,
      4,
      5,
      7,
      12
    ],
    "pitch_range_midi": [
      60,
      79
    ],
    "tempo_bpm": 90,
    "meter": [
      4,
      4
    ],
    "hints": true
  },
  "purpose": "Name intervals across a wider listening set.",
  "instructions": {
    "student": "Work across the full selected set. Keep a note of the two names you confuse instead of treating all errors alike.",
    "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": "Identify two new pairs after corrections. These use new generated input and remain separate from familiar-question retries."
  },
  "examples": {
    "demonstration": {
      "id": "m16-711657-0",
      "seed": 711657,
      "kind": "interval",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 65,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 61,
              "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"
            }
          ]
        }
      ],
      "answer": "4",
      "explanation": "C#4 to F4: 4 semitones, ascending. Major third.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F4"
        ]
      },
      "total_beats": 2
    },
    "comparison": {
      "id": "m16-711657-0",
      "seed": 711657,
      "kind": "interval",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 66,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 61,
              "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": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        }
      ],
      "answer": "5",
      "explanation": "C#4 to F#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "F#4"
        ]
      },
      "total_beats": 2
    },
    "seed": 711657,
    "comparisonSeed": 711657
  },
  "questions": [
    {
      "id": "m16-710041-0",
      "seed": 710041,
      "kind": "interval",
      "events": [
        {
          "midi": 61,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 63,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 61,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 61,
              "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"
            }
          ]
        }
      ],
      "answer": "2",
      "explanation": "C#4 to D#4: 2 semitones, ascending. Major second.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "D#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-1",
      "seed": 717960,
      "kind": "interval",
      "events": [
        {
          "midi": 60,
          "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"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 62,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 60,
              "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": "12",
      "explanation": "C4 to C5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-2",
      "seed": 725879,
      "kind": "interval",
      "events": [
        {
          "midi": 60,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 63,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 62,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 60,
              "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": "3",
      "explanation": "C4 to D#4: 3 semitones, ascending. Minor third.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-3",
      "seed": 733798,
      "kind": "interval",
      "events": [
        {
          "midi": 65,
          "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"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 65,
              "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": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 65,
              "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"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 65,
              "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": "5",
      "explanation": "F4 to A#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-4",
      "seed": 741717,
      "kind": "interval",
      "events": [
        {
          "midi": 64,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 69,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 64,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 64,
              "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": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 64,
              "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": "5",
      "explanation": "E4 to A4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "A4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-5",
      "seed": 749636,
      "kind": "interval",
      "events": [
        {
          "midi": 60,
          "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"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 62,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 63,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 64,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 60,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 60,
              "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": "12",
      "explanation": "C4 to C5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-6",
      "seed": 757555,
      "kind": "interval",
      "events": [
        {
          "midi": 63,
          "onset_beats": 0,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        },
        {
          "midi": 68,
          "onset_beats": 1,
          "duration_beats": 0.8,
          "velocity": 0.7,
          "voice_id": "triangle"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 63,
              "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": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 63,
              "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": "5",
      "explanation": "D#4 to G#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "G#4"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-7",
      "seed": 765474,
      "kind": "interval",
      "events": [
        {
          "midi": 67,
          "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"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 67,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 67,
              "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": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 67,
              "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": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 67,
              "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"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 67,
              "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": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 67,
              "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": "5",
      "explanation": "G4 to C5: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-8",
      "seed": 773393,
      "kind": "interval",
      "events": [
        {
          "midi": 63,
          "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": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 65,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 66,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 63,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 63,
              "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": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 63,
              "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": "12",
      "explanation": "D#4 to D#5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "D#5"
        ]
      },
      "total_beats": 2
    },
    {
      "id": "m16-710041-9",
      "seed": 781312,
      "kind": "interval",
      "events": [
        {
          "midi": 65,
          "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"
        }
      ],
      "choices": [
        {
          "id": "2",
          "label": "Major second",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 67,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "3",
          "label": "Minor third",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 68,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "4",
          "label": "Major third",
          "events": [
            {
              "midi": 65,
              "onset_beats": 0,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            },
            {
              "midi": 69,
              "onset_beats": 1,
              "duration_beats": 0.8,
              "velocity": 0.7,
              "voice_id": "triangle"
            }
          ]
        },
        {
          "id": "5",
          "label": "Perfect fourth",
          "events": [
            {
              "midi": 65,
              "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": "7",
          "label": "Perfect fifth",
          "events": [
            {
              "midi": 65,
              "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"
            }
          ]
        },
        {
          "id": "12",
          "label": "Octave",
          "events": [
            {
              "midi": 65,
              "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": "5",
      "explanation": "F4 to A#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A#4"
        ]
      },
      "total_beats": 2
    }
  ],
  "answer_key": [
    {
      "number": 1,
      "question_id": "m16-710041-0",
      "answer": "2",
      "label": "Major second",
      "explanation": "C#4 to D#4: 2 semitones, ascending. Major second.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C#4",
          "D#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 2,
      "question_id": "m16-710041-1",
      "answer": "12",
      "label": "Octave",
      "explanation": "C4 to C5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 3,
      "question_id": "m16-710041-2",
      "answer": "3",
      "label": "Minor third",
      "explanation": "C4 to D#4: 3 semitones, ascending. Minor third.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "D#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 4,
      "question_id": "m16-710041-3",
      "answer": "5",
      "label": "Perfect fourth",
      "explanation": "F4 to A#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 5,
      "question_id": "m16-710041-4",
      "answer": "5",
      "label": "Perfect fourth",
      "explanation": "E4 to A4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "E4",
          "A4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 6,
      "question_id": "m16-710041-5",
      "answer": "12",
      "label": "Octave",
      "explanation": "C4 to C5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "C4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 7,
      "question_id": "m16-710041-6",
      "answer": "5",
      "label": "Perfect fourth",
      "explanation": "D#4 to G#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "G#4"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 8,
      "question_id": "m16-710041-7",
      "answer": "5",
      "label": "Perfect fourth",
      "explanation": "G4 to C5: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "G4",
          "C5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 9,
      "question_id": "m16-710041-8",
      "answer": "12",
      "label": "Octave",
      "explanation": "D#4 to D#5: 12 semitones, ascending. Octave.",
      "notation": {
        "clef": "treble",
        "notes": [
          "D#4",
          "D#5"
        ]
      },
      "total_beats": 2
    },
    {
      "number": 10,
      "question_id": "m16-710041-9",
      "answer": "5",
      "label": "Perfect fourth",
      "explanation": "F4 to A#4: 5 semitones, ascending. Perfect fourth.",
      "notation": {
        "clef": "treble",
        "notes": [
          "F4",
          "A#4"
        ]
      },
      "total_beats": 2
    }
  ],
  "record": {
    "learner": "",
    "date": "",
    "first_responses": "",
    "same_question_corrections": "",
    "new_question_check": ""
  }
}