music/exemplars/instruments/MELODY_BANDS.json
{
"_doc": "MELODY BANDS -- the corpus's own melodic norms, per purpose class",
"_honest_tier": "MEASURED. These are PERCENTILES OF THE MUSIC JOSH NAMED, not quality bars anybody proved. A cue inside every band has not been called good; it has been called normal for this corpus.",
"instrument": "melody_bands",
"version": "melody-bands/1.0",
"law": "A composed melody must land inside the note-density, interval-mix, contour, phrase-arc, harmonisation and compass bands that the corpus's own melodies occupy -- a few notes slowly played back to back with nothing sounding under them is outside them.",
"generated_utc": "2026-08-08T19:51:31Z",
"provenance": {
"pool": "30 corpus HITS measured on audio (dp.label_rows :387, status ACQUIRED or CARDED)",
"hits_available": 30,
"tier": "audio",
"analysis_cap_s": 180.0,
"line_extractor": "instr_summit_tests.audio_reduction :725 -- mi.note_line :323 with _octave_repair :748 applied",
"band_extractor": "mi.band_lines :355 off mi._salience :248; melodic activity gated by mi.counter_melody :927",
"class_floor": 5,
"seed": 20260808
},
"extraction_quality": {
"definition": "melodic_coverage = share of the analysed span on which the extracted line is sounding at all",
"median_coverage": 0.3907,
"rows_below_0.10_coverage": [
"EX_007 Frog's Theme (coverage 0.0199, 13 notes)",
"EX_053 Cynthia Battle Theme (coverage 0.0499, 38 notes)",
"EX_055 The Cyber Grind (coverage 0.0585, 69 notes)",
"EX_094 Dark Creature Pursuit (coverage 0.0472, 35 notes)",
"EX_142 Shinshu Field (coverage 0.0209, 35 notes)",
"EX_145 Go Straight (coverage 0.0966, 156 notes)",
"EX_147 Fighting of the Spirit (coverage 0.0402, 56 notes)"
],
"rows_below_the_12-note_floor": [
"EX_014 Tekken 2 Attract Movie: Sound Track (8 notes)"
],
"consequence": "these rows carry None on every axis below the floor and are excluded from those percentiles by construction; the per-axis `n` on each band is the count that actually stood behind it"
},
"axes": {
"note_density_per_s": {
"what": "notes of the melodic line per second of analysed cue",
"source": "CORPUS-DERIVED",
"why": "the axis that fails 'a few notes slowly played back to back'"
},
"note_density_per_sounding_s": {
"what": "notes per second the line is sounding",
"source": "CORPUS-DERIVED",
"why": "separates a sparse tune from an absent one"
},
"step_share": {
"what": "share of |intervals| <= 2 semitones",
"source": "CITED docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:57 ECON-05 (boundary); band CORPUS-DERIVED",
"why": "conjunct motion is the school's singability claim"
},
"leap_share": {
"what": "share of |intervals| >= 7 semitones",
"source": "CITED docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:57 ECON-05 (boundary); band CORPUS-DERIVED",
"why": "the signature leap, and its absence"
},
"interval_class_count": {
"what": "distinct |interval| sizes used, capped at 12+",
"source": "CORPUS-DERIVED",
"why": "'no complexity' as a vocabulary count, never an entropy"
},
"contour_turning_rate": {
"what": "direction changes per note of the line",
"source": "CORPUS-DERIVED",
"why": "does the shape move"
},
"contour_depth": {
"what": "median Douglas-Peucker depth (mi.contour_depth :480)",
"source": "CORPUS-DERIVED",
"why": "hierarchy of shape, not turn count"
},
"phrase_len_s_median": {
"what": "median phrase length in seconds (mi.segment_phrases :762)",
"source": "CORPUS-DERIVED",
"why": "phrase-arc norm"
},
"phrase_peak_position": {
"what": "median normalised position of the phrase's highest note",
"source": "CORPUS-DERIVED",
"why": "phrase-arc norm"
},
"harmonization_density": {
"what": "share of melodic sounding-time with >= 2 concurrent voices",
"source": "CORPUS-DERIVED",
"why": "'never any harmonies added on', in a number"
},
"parallel_harmony_share": {
"what": "share of lead notes with a concurrent consonant voice",
"source": "UNCITED CRAFT DEFAULT (consonant set); band CORPUS-DERIVED",
"why": "the narrower reading of the same clause"
},
"range_semitones": {
"what": "compass of the line",
"source": "CITED docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:56 ECON-04 (<=17 for the hook); band CORPUS-DERIVED over the WHOLE LINE, a different quantity",
"why": "singable span"
},
"distinct_durations": {
"what": "distinct log2 duration classes in the line",
"source": "CITED docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:59 ECON-07 (<=4 for the hook); band CORPUS-DERIVED over the WHOLE LINE",
"why": "'no rhythm' as a rhythmic-vocabulary count"
}
},
"craft_comparison": {
"ECON-05 step_share >= 0.60": {
"cited": "docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:57",
"craft_target": 0.6,
"corpus_median": 0.6722,
"corpus_share_meeting_target": 0.6552,
"n": 29
},
"ECON-05 leap 1-2 per 8-bar phrase": {
"cited": "docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:57",
"corpus_median_leap_share": 0.0562,
"note": "the craft rule counts leaps PER 8-BAR PHRASE and this is a SHARE of all intervals; they are not the same quantity and no equivalence is claimed",
"n": 29
},
"ECON-04 hook range <= 17 semitones": {
"cited": "docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:56",
"craft_target": 17.0,
"corpus_median_WHOLE_LINE_range": 18.0,
"corpus_share_within_target": 0.4828,
"note": "the craft target is the HOOK's span; this is the WHOLE LINE's span over up to three minutes, which is necessarily wider. Reported, never enforced",
"n": 29
},
"ECON-07 distinct durations <= 4": {
"cited": "docs/proposals/music/school_grammars/SNES_JRPG_SCHOOL.md:59",
"craft_target": 4,
"corpus_median_WHOLE_LINE": 9.0,
"corpus_share_within_target": 0.0345,
"note": "hook vs whole line again; and the brief that commissioned this file cited ECON-07 at line 60, which is ECON-08. The rule is at :59",
"n": 29
}
},
"classes": {
"BATTLE": {
"n": 5,
"pooled": false,
"tracks": [
"EX_046",
"EX_053",
"EX_055",
"EX_145",
"EX_147"
],
"axes": {
"note_density_per_s": {
"n": 5,
"under_floor": false,
"p10": 0.34,
"p50": 0.4158,
"p90": 0.8645,
"min": 0.3111,
"max": 0.8667
},
"note_density_per_sounding_s": {
"n": 5,
"under_floor": false,
"p10": 6.0917,
"p50": 7.7299,
"p90": 8.7168,
"min": 5.7845,
"max": 8.9758
},
"step_share": {
"n": 5,
"under_floor": false,
"p10": 0.7129,
"p50": 0.7871,
"p90": 0.8152,
"min": 0.6912,
"max": 0.8182
},
"leap_share": {
"n": 5,
"under_floor": false,
"p10": 0.0,
"p50": 0.0,
"p90": 0.0572,
"min": 0.0,
"max": 0.071
},
"interval_class_count": {
"n": 5,
"under_floor": false,
"p10": 6.0,
"p50": 7.0,
"p90": 8.2,
"min": 6,
"max": 9
},
"contour_turning_rate": {
"n": 5,
"under_floor": false,
"p10": 0.3268,
"p50": 0.4286,
"p90": 0.4876,
"min": 0.3032,
"max": 0.5263
},
"contour_depth": {
"n": 5,
"under_floor": false,
"p10": 5.1,
"p50": 6.0,
"p90": 6.0,
"min": 4.5,
"max": 6.0
},
"phrase_len_s_median": {
"n": 5,
"under_floor": false,
"p10": 3.0556,
"p50": 7.523,
"p90": 13.7696,
"min": 2.74,
"max": 13.886
},
"phrase_peak_position": {
"n": 5,
"under_floor": false,
"p10": 0.0,
"p50": 0.0,
"p90": 0.1599,
"min": 0.0,
"max": 0.1641
},
"harmonization_density": {
"n": 3,
"under_floor": true,
"p10": 0.0489,
"p50": 0.2446,
"p90": 0.466,
"min": 0.0,
"max": 0.5213
},
"parallel_harmony_share": {
"n": 3,
"under_floor": true,
"p10": 0.1152,
"p50": 0.3654,
"p90": 0.3874,
"min": 0.0526,
"max": 0.3929
},
"range_semitones": {
"n": 5,
"under_floor": false,
"p10": 6.866,
"p50": 8.0,
"p90": 13.398,
"min": 6.33,
"max": 14.33
},
"distinct_durations": {
"n": 5,
"under_floor": false,
"p10": 5.0,
"p50": 7.0,
"p90": 8.2,
"min": 5,
"max": 9
}
}
},
"EXPLORATION": {
"n": 8,
"pooled": false,
"tracks": [
"EX_017",
"EX_018",
"EX_022",
"EX_030",
"EX_032",
"EX_033",
"EX_136",
"EX_142"
],
"axes": {
"note_density_per_s": {
"n": 8,
"under_floor": false,
"p10": 1.1978,
"p50": 1.9611,
"p90": 2.7039,
"min": 0.1944,
"max": 2.8167
},
"note_density_per_sounding_s": {
"n": 8,
"under_floor": false,
"p10": 2.2247,
"p50": 5.7876,
"p90": 8.1449,
"min": 2.207,
"max": 9.3045
},
"step_share": {
"n": 8,
"under_floor": false,
"p10": 0.5048,
"p50": 0.5902,
"p90": 0.8515,
"min": 0.3973,
"max": 0.9118
},
"leap_share": {
"n": 8,
"under_floor": false,
"p10": 0.0,
"p50": 0.0911,
"p90": 0.1772,
"min": 0.0,
"max": 0.2232
},
"interval_class_count": {
"n": 8,
"under_floor": false,
"p10": 6.4,
"p50": 8.5,
"p90": 10.3,
"min": 5,
"max": 11
},
"contour_turning_rate": {
"n": 8,
"under_floor": false,
"p10": 0.3275,
"p50": 0.4254,
"p90": 0.5088,
"min": 0.3138,
"max": 0.5973
},
"contour_depth": {
"n": 8,
"under_floor": false,
"p10": 5.0,
"p50": 6.0,
"p90": 7.3,
"min": 5.0,
"max": 8.0
},
"phrase_len_s_median": {
"n": 8,
"under_floor": false,
"p10": 1.73,
"p50": 2.351,
"p90": 11.056,
"min": 1.73,
"max": 25.287
},
"phrase_peak_position": {
"n": 8,
"under_floor": false,
"p10": 0.0524,
"p50": 0.1965,
"p90": 0.3501,
"min": 0.0,
"max": 0.3519
},
"harmonization_density": {
"n": 8,
"under_floor": false,
"p10": 0.4049,
"p50": 0.8248,
"p90": 0.9346,
"min": 0.0,
"max": 0.9493
},
"parallel_harmony_share": {
"n": 8,
"under_floor": false,
"p10": 0.3301,
"p50": 0.5817,
"p90": 0.6548,
"min": 0.2563,
"max": 0.6857
},
"range_semitones": {
"n": 8,
"under_floor": false,
"p10": 7.282,
"p50": 19.0,
"p90": 31.1,
"min": 7.17,
"max": 36.0
},
"distinct_durations": {
"n": 8,
"under_floor": false,
"p10": 5.7,
"p50": 8.5,
"p90": 11.3,
"min": 5,
"max": 12
}
}
},
"POOLED_SMALL_CLASSES": {
"n": 17,
"pooled": true,
"member_classes": {
"BOSS": 2,
"CREDITS_TRIUMPH": 4,
"MELANCHOLIC": 4,
"TENSION": 3,
"TITLE_CHARACTER": 4
},
"reason": "each of these classes carries fewer than 5 corpus hits, so it gets no band of its own; they are POOLED and this is said out loud rather than one class silently borrowing another's percentiles",
"tracks": [
"EX_006",
"EX_007",
"EX_014",
"EX_064",
"EX_075",
"EX_082",
"EX_088",
"EX_092",
"EX_094",
"EX_102",
"EX_110",
"EX_113",
"EX_124",
"EX_161",
"EX_162",
"EX_179",
"EX_180"
],
"axes": {
"note_density_per_s": {
"n": 16,
"under_floor": false,
"p10": 0.374,
"p50": 1.7976,
"p90": 2.5046,
"min": 0.1555,
"max": 3.1088
},
"note_density_per_sounding_s": {
"n": 16,
"under_floor": false,
"p10": 2.6753,
"p50": 4.0685,
"p90": 6.9276,
"min": 1.4987,
"max": 7.8303
},
"step_share": {
"n": 16,
"under_floor": false,
"p10": 0.4536,
"p50": 0.6659,
"p90": 0.8655,
"min": 0.4128,
"max": 0.8921
},
"leap_share": {
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"under_floor": false,
"p10": 0.0103,
"p50": 0.0496,
"p90": 0.1261,
"min": 0.0,
"max": 0.1812
},
"interval_class_count": {
"n": 16,
"under_floor": false,
"p10": 7.5,
"p50": 8.5,
"p90": 11.0,
"min": 5,
"max": 11
},
"contour_turning_rate": {
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"under_floor": false,
"p10": 0.2077,
"p50": 0.371,
"p90": 0.4944,
"min": 0.1357,
"max": 0.5698
},
"contour_depth": {
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"under_floor": false,
"p10": 4.0,
"p50": 5.75,
"p90": 7.0,
"min": 3.0,
"max": 8.0
},
"phrase_len_s_median": {
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"under_floor": false,
"p10": 1.884,
"p50": 2.7745,
"p90": 8.7365,
"min": 1.149,
"max": 28.671
},
"phrase_peak_position": {
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"under_floor": false,
"p10": 0.0,
"p50": 0.1684,
"p90": 0.3405,
"min": 0.0,
"max": 0.5029
},
"harmonization_density": {
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"under_floor": false,
"p10": 0.3471,
"p50": 0.8007,
"p90": 0.9613,
"min": 0.2931,
"max": 0.9835
},
"parallel_harmony_share": {
"n": 16,
"under_floor": false,
"p10": 0.1764,
"p50": 0.4089,
"p90": 0.7358,
"min": 0.0286,
"max": 0.8889
},
"range_semitones": {
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"under_floor": false,
"p10": 11.0,
"p50": 19.0,
"p90": 45.0,
"min": 5.33,
"max": 55.0
},
"distinct_durations": {
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"under_floor": false,
"p10": 8.0,
"p50": 10.0,
"p90": 12.5,
"min": 4,
"max": 14
}
}
},
"ALL": {
"n": 30,
"pooled": true,
"reason": "every hit, regardless of class -- the fallback band for a cue whose purpose class the corpus does not carry",
"tracks": [
"EX_006",
"EX_007",
"EX_014",
"EX_017",
"EX_018",
"EX_022",
"EX_030",
"EX_032",
"EX_033",
"EX_046",
"EX_053",
"EX_055",
"EX_064",
"EX_075",
"EX_082",
"EX_088",
"EX_092",
"EX_094",
"EX_102",
"EX_110",
"EX_113",
"EX_124",
"EX_136",
"EX_142",
"EX_145",
"EX_147",
"EX_161",
"EX_162",
"EX_179",
"EX_180"
],
"axes": {
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"under_floor": false,
"p10": 0.3096,
"p50": 1.7564,
"p90": 2.5429,
"min": 0.1555,
"max": 3.1088
},
"note_density_per_sounding_s": {
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"under_floor": false,
"p10": 2.5369,
"p50": 4.9857,
"p90": 7.9299,
"min": 1.4987,
"max": 9.3045
},
"step_share": {
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"under_floor": false,
"p10": 0.4758,
"p50": 0.6722,
"p90": 0.8538,
"min": 0.3973,
"max": 0.9118
},
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},
"interval_class_count": {
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"min": 5,
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},
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},
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},
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},
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},
"harmonization_density": {
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"under_floor": false,
"p10": 0.2737,
"p50": 0.7446,
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"min": 0.0,
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},
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},
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},
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"p10": 5.0,
"p50": 9.0,
"p90": 12.0,
"min": 4,
"max": 14
}
}
}
},
"tracks": [
{
"track_id": "EX_006",
"title": "Chrono Trigger Main Theme",
"game": "Chrono Trigger",
"purpose_class": "TITLE_CHARACTER",
"album": "Chrono Trigger (Original Soundtrack) [DS",
"line_note_count": 268,
"voiced_fraction": 0.4926,
"melodic_coverage": 0.4861,
"octave_errors_repaired": 23,
"cached": true,
"note_density_per_s": 1.7564,
"note_density_per_sounding_s": 3.6136,
"step_share": 0.7416,
"leap_share": 0.0562,
"interval_class_count": 8,
"contour_turning_rate": 0.2687,
"contour_depth": 5.0,
"phrase_len_s_median": 4.145,
"phrase_peak_position": 0.0,
"harmonization_density": 0.5648,
"parallel_harmony_share": 0.3396,
"range_semitones": 16.0,
"distinct_durations": 11
},
{
"track_id": "EX_007",
"title": "Frog's Theme",
"game": "Chrono Trigger",
"purpose_class": "TITLE_CHARACTER",
"album": "Chrono Trigger (Original Soundtrack) [DS",
"line_note_count": 13,
"voiced_fraction": 0.0285,
"melodic_coverage": 0.0199,
"octave_errors_repaired": 3,
"cached": true,
"note_density_per_s": 0.1555,
"note_density_per_sounding_s": 7.8303,
"step_share": 0.4167,
"leap_share": 0.0,
"interval_class_count": 5,
"contour_turning_rate": 0.4615,
"contour_depth": 7.0,
"phrase_len_s_median": 28.671,
"phrase_peak_position": 0.3272,
"harmonization_density": 0.7148,
"parallel_harmony_share": 0.6923,
"range_semitones": 5.33,
"distinct_durations": 4
},
{
"track_id": "EX_014",
"title": "Tekken 2 Attract Movie: Sound Track",
"game": "Tekken 2",
"purpose_class": "TITLE_CHARACTER",
"album": "Tekken 2 (Original Soundtrack)",
"line_note_count": 8,
"voiced_fraction": 0.1512,
"melodic_coverage": null,
"octave_errors_repaired": 1,
"cached": true,
"note_density_per_s": null,
"note_density_per_sounding_s": null,
"step_share": null,
"leap_share": null,
"interval_class_count": null,
"contour_turning_rate": null,
"contour_depth": null,
"phrase_len_s_median": null,
"phrase_peak_position": null,
"harmonization_density": null,
"parallel_harmony_share": null,
"range_semitones": null,
"distinct_durations": null
},
{
"track_id": "EX_017",
"title": "Sweden",
"game": "Minecraft",
"purpose_class": "EXPLORATION",
"album": "C418 - Minecraft - Volume Alpha",
"line_note_count": 293,
"voiced_fraction": 0.7443,
"melodic_coverage": 0.7376,
"octave_errors_repaired": 194,
"cached": true,
"note_density_per_s": 1.6278,
"note_density_per_sounding_s": 2.207,
"step_share": 0.3973,
"leap_share": 0.1575,
"interval_class_count": 10,
"contour_turning_rate": 0.5973,
"contour_depth": 7.0,
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