{
  "duration_seconds": 75,
  "pitch_system": {
    "encoding": "ratio",
    "reference_hz": 180,
    "pitches": [
      0.618,
      1.0,
      1.618,
      2.618,
      4.236,
      6.854,
      11.09,
      17.944
    ],
    "octave_repeats": false
  },
  "rhythm_system": {
    "type": "metric",
    "tempo_bpm": 50,
    "beats_per_cycle": 12,
    "subdivisions_per_beat": 4,
    "accent_pattern": [
      1.0,
      0.4,
      0.6,
      0.4,
      0.5,
      0.4,
      0.8,
      0.4,
      0.6,
      0.4,
      0.5,
      0.4
    ]
  },
  "voices": [
    {
      "name": "choir_A_low",
      "timbre": "soft_pad",
      "pitch_indices": [
        1,
        2,
        3
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.6,
      "spatial_position": [
        -0.85,
        0.0
      ],
      "active_sections": [
        "A_1",
        "A_2",
        "A_3"
      ]
    },
    {
      "name": "choir_A_mid",
      "timbre": "soft_pad",
      "pitch_indices": [
        3,
        4,
        5
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.55,
      "spatial_position": [
        -0.75,
        0.1
      ],
      "active_sections": [
        "A_1",
        "A_2",
        "A_3"
      ]
    },
    {
      "name": "choir_A_high",
      "timbre": "bamboo_flute",
      "pitch_indices": [
        5,
        6,
        7
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.5,
      "spatial_position": [
        -0.7,
        -0.1
      ],
      "active_sections": [
        "A_1",
        "A_2",
        "A_3"
      ]
    },
    {
      "name": "choir_B_low",
      "timbre": "soft_pad",
      "pitch_indices": [
        0,
        1,
        2
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.6,
      "spatial_position": [
        0.85,
        0.0
      ],
      "active_sections": [
        "B_1",
        "B_2",
        "B_3"
      ]
    },
    {
      "name": "choir_B_mid",
      "timbre": "soft_pad",
      "pitch_indices": [
        2,
        3,
        4
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.55,
      "spatial_position": [
        0.75,
        0.1
      ],
      "active_sections": [
        "B_1",
        "B_2",
        "B_3"
      ]
    },
    {
      "name": "choir_B_high",
      "timbre": "bamboo_flute",
      "pitch_indices": [
        4,
        5,
        6
      ],
      "rhythm_role": "ostinato",
      "amplitude": 0.5,
      "spatial_position": [
        0.7,
        -0.1
      ],
      "active_sections": [
        "B_1",
        "B_2",
        "B_3"
      ]
    }
  ],
  "form": {
    "arc_type": "through_composed",
    "sections": [
      {
        "name": "A_1",
        "start_seconds": 0,
        "duration_seconds": 10,
        "character": "choir A \u2014 opening phrase of fragment",
        "chord_tones": [
          0,
          2,
          4
        ]
      },
      {
        "name": "gap_1",
        "start_seconds": 10,
        "duration_seconds": 2,
        "character": "structural silence",
        "chord_tones": []
      },
      {
        "name": "B_1",
        "start_seconds": 12,
        "duration_seconds": 10,
        "character": "choir B answers, parallel spiral motion",
        "chord_tones": [
          4,
          6,
          1
        ]
      },
      {
        "name": "gap_2",
        "start_seconds": 22,
        "duration_seconds": 2,
        "character": "structural silence",
        "chord_tones": []
      },
      {
        "name": "A_2",
        "start_seconds": 24,
        "duration_seconds": 12,
        "character": "choir A \u2014 extended phrase",
        "chord_tones": [
          0,
          2,
          4,
          5
        ]
      },
      {
        "name": "gap_3",
        "start_seconds": 36,
        "duration_seconds": 2,
        "character": "structural silence",
        "chord_tones": []
      },
      {
        "name": "B_2",
        "start_seconds": 38,
        "duration_seconds": 12,
        "character": "choir B \u2014 extended answer",
        "chord_tones": [
          3,
          5,
          6
        ]
      },
      {
        "name": "gap_4",
        "start_seconds": 50,
        "duration_seconds": 2,
        "character": "structural silence",
        "chord_tones": []
      },
      {
        "name": "A_3",
        "start_seconds": 52,
        "duration_seconds": 9,
        "character": "choir A \u2014 fragment closing",
        "chord_tones": [
          0,
          2,
          4,
          7
        ]
      },
      {
        "name": "gap_5",
        "start_seconds": 61,
        "duration_seconds": 2,
        "character": "structural silence",
        "chord_tones": []
      },
      {
        "name": "B_3",
        "start_seconds": 63,
        "duration_seconds": 12,
        "character": "choir B \u2014 ends mid-phrase",
        "chord_tones": [
          6,
          1,
          3
        ]
      }
    ]
  },
  "ornamentation": {
    "density": 0.87,
    "rule": "Each struck pitch carries a micro-rhythmic figure \u2014 a grace-beat either immediately before or after the main onset. No pitch bending."
  }
}