music/exemplars/instruments/GROOVE_VALIDATION.json
{
"_doc": "THE RHYTHM INSTRUMENT -- seven audio axes and six score axes, calibrated before use",
"_honest_tier": "MEASURED INSTRUMENT. Nothing here has been listened to.",
"instrument": "groove_instrument",
"version": "groove-instr/1.0",
"law": "A cue must carry a pulse a listener can feel -- present, steady, and articulated against the metre by voices that tile rather than pile -- so that its rhythm is a structure and never merely a rate.",
"generated_utc": "2026-08-08T20:07:00Z",
"controls_failed": 0,
"controls": {
"C1_click_train_120bpm": {
"pulse_salience_audio": 0.8967,
"beat_consistency": 0.9941,
"syncopation_audio": 0.0,
"offbeat_weight_share": 0.25,
"onset_density_per_s": 1.9667,
"percussive_energy_share": 1.0,
"low_band_pulse_regularity": 0.8689
},
"C2_white_noise": {
"pulse_salience_audio": 0.0899,
"beat_consistency": 0.9381,
"syncopation_audio": 0.0,
"offbeat_weight_share": 0.0,
"onset_density_per_s": 0.0333,
"percussive_energy_share": 0.5,
"low_band_pulse_regularity": 0.0731
},
"C3_anti_degeneracy": {
"planted_2_per_s": 1.9667,
"planted_12_per_s": 11.9667
},
"C3c_delta_sweep": {
"note": "delta -> [2/s anchor, 12/s anchor]; ONSET_DELTA was chosen as the midpoint of the plateau where both recover",
"sweep": {
"0.1": [
1.967,
11.967
],
"0.15": [
1.967,
11.967
],
"0.2": [
1.967,
11.967
],
"0.3": [
1.967,
11.833
]
}
},
"C4_card_field_is_degenerate": {
"n_cards": 1180,
"min": 10.704,
"max": 10.89,
"median": 10.7675,
"span_frac_of_median": 0.01727,
"distinct_values_2dp": 20,
"frame_rate_quarter": 10.767
},
"C5_tresillo_vs_four_on_floor": {
"four_on_floor": {
"syncopation_audio": 0.0,
"offbeat_weight_share": 0.25,
"pulse_salience_audio": 0.8967,
"onset_density_per_s": 1.9667
},
"tresillo": {
"syncopation_audio": 0.2,
"offbeat_weight_share": 0.4,
"pulse_salience_audio": 0.2843,
"onset_density_per_s": 1.4667
}
},
"C5c_tracker_limit": {
"locked_tempo": 120.0,
"free_tempo": 79.51,
"locked_syncopation": 0.2,
"free_syncopation": 0.0,
"note": "THE AUDIO TIER'S LARGEST LIMIT, printed rather than hidden: a heavily syncopated pattern with no other reference pulls the beat tracker onto its own inter-onset period, and syncopation_audio then reads that grid. Every real pool is measured with the soft prior, so this error is present in the corpus numbers too."
},
"C6_pulse_is_not_density": {
"periodic": {
"density": 1.9667,
"pulse": 0.8967
},
"randomised_same_count": {
"density": 1.9667,
"pulse": 0.0581
}
},
"C7_held_tone": {
"env_max": 0.038,
"degenerate": "the onset-strength envelope never exceeds 1.0 dB of summed positive flux (peak 0.038); this signal contains no transient, so every ONSET-derived axis here would be reading numerical noise. The two energy shares above are spectrogram properties and stand.",
"density": 0.0
},
"C7b_scale_invariance": {
"0.01": 47.438,
"1.0": 49.66,
"100.0": 49.66
},
"C8_percussive_share": {
"drums": 1.0,
"sustained_pad": 0.0005
},
"C9_low_band": {
"regular_low_pulse": 0.8974,
"jittered_low_pulse": 0.0676,
"high_band_only": {
"regularity": 0.9,
"low_band_energy_share": 0.0,
"low_pulse_low_band_energy_share": 0.9599
},
"stated_limit": "a short high-frequency burst leaks into the low band, so a high-band-only train still reads a REGULAR low band. This axis is a PERIODICITY number, and detail.low_band_energy_share is reported beside it so a reader can tell a low groove from leakage: the two shares above are the size of that difference."
},
"C10_empty_card": {
"available": false,
"reason": "no audio and no plan: every axis here needs one or the other, because the card's only rhythm field (groove.onset_rate_per_s) is degenerate across the whole corpus and is refused by this instrument"
},
"C11_toy_plan": {
"sync_score": 0.2333,
"sync_composite": 0.1333,
"pulse_score": 0.5294,
"interlock": 1.0,
"onset_synchrony": 0.0,
"onset_synchrony_max": 0.0
},
"C11c_doubled_voice": {
"sync_score": 0.3111,
"sync_composite": 0.1333,
"pulse_score": 0.5294,
"interlock": 0.6667,
"onset_synchrony": 0.3333,
"onset_synchrony_max": 1.0
},
"C11d_flattened_voice": {
"sync_score": 0.1,
"sync_composite": 0.0,
"pulse_score": 1.0,
"interlock": 1.0,
"onset_synchrony": 0.0,
"onset_synchrony_max": 0.0
},
"mutation_arms": [
{
"arm": "randomise the onset TIMES at a fixed count",
"must_be_caught_by": "pulse_salience_audio",
"fired": true,
"must_hold": "onset_density_per_s",
"held": true,
"detail": "pulse 0.8967 -> 0.0581 while density held at 1.9667"
},
{
"arm": "double the click rate",
"must_be_caught_by": "onset_density_per_s",
"fired": true,
"must_hold": "percussive_energy_share",
"held": true,
"detail": "density 1.9667 -> 3.9667; percussive share 1.0 -> 1.0"
},
{
"arm": "replace the drums with a sustained pad",
"must_be_caught_by": "percussive_energy_share",
"fired": true,
"must_hold": "onset_density_per_s (the pad is DEGENERATE and reads 0.0, not a rhythm)",
"held": true,
"detail": "percussive share 1.0 -> 0.0005; pad density 0.0"
},
{
"arm": "move a tresillo's off-beats onto the beat",
"must_be_caught_by": "syncopation_audio",
"fired": true,
"must_hold": "onset_density_per_s",
"held": true,
"detail": "syncopation 0.2 -> 0.0 (densities 1.4667 / 1.9667)"
},
{
"arm": "add a third drum that DOUBLES the tom's exact grid",
"must_be_caught_by": "onset_synchrony_max",
"fired": true,
"must_hold": "pulse_score and sync_composite (the composite UNION is unchanged, so both must be EXACTLY equal)",
"held": true,
"detail": "synchrony_max 0.0 -> 1.0, interlock 1.0 -> 0.6667; pulse_score held exactly at 0.5294 and sync_composite at 0.1333"
},
{
"arm": "move the tom's off-beats onto beats the bass drum does not occupy",
"must_be_caught_by": "sync_score",
"fired": true,
"must_hold": "interlock (the two voices still share no position)",
"held": true,
"detail": "sync_score 0.2333 -> 0.1; interlock held at 1.0"
}
],
"controls_run_utc": "2026-08-08T19:53:44Z"
},
"pool": {
"cards": 1180,
"hits": 30,
"hits_measured": 30,
"siblings_available": 927,
"siblings_sampled": 100,
"siblings_measured": 100,
"round_1": 32,
"round_2": 3,
"round_3": 3,
"albums_with_a_hit": 18,
"sibling_rule": "per album: sort by track_id, shuffle(seed=20260808), take 6",
"analysis_cap_s": 180.0,
"seed": 20260808
},
"bands": {
"_doc": "per-purpose-class rhythm bands, derived from the corpus HITS on the AUDIO tier",
"instrument": "groove_instrument",
"version": "groove-instr/1.0",
"law": "A cue must carry a pulse a listener can feel -- present, steady, and articulated against the metre by voices that tile rather than pile -- so that its rhythm is a structure and never merely a rate.",
"generated_utc": "2026-08-08T20:07:00Z",
"available": true,
"provenance": {
"pool": "corpus rows whose status is ACQUIRED or CARDED (derive_patterns.label_rows), measured on the audio tier from the source files named on their own cards",
"n_hits_measured": 30,
"min_rows_for_a_class_band": 5,
"pooled_classes": [
"BOSS (n=2)",
"CREDITS_TRIUMPH (n=4)",
"MELANCHOLIC (n=4)",
"TENSION (n=3)",
"TITLE_CHARACTER (n=4)"
],
"pooled_note": "A class with fewer than five rows does NOT get its own band. Those classes route to POOLED_ALL_CLASSES, whose denominator is every measured hit regardless of class, and that pooling is a real loss of resolution rather than a technicality.",
"analysis_cap_s": 180.0,
"hop": 256,
"onset_delta": 0.15,
"onset_env_floor": 1.0,
"seed": 20260808,
"score_tier": "NO SCORE BANDS EXIST AND NONE ARE INVENTED. The corpus is audio only; we hold no scores for it. The score axes are reported against our own rounds and against groove.py's own library values, never against a corpus band.",
"forbidden_field": "tempo_and_time_grammar.groove.onset_rate_per_s is DEGENERATE (docs/spine/DECISIONS_PENDING_JOSH.md:5685-5691) and is read nowhere in this instrument; control C4 re-derives that degeneracy live on every --check."
},
"pooled_key": "POOLED_ALL_CLASSES",
"axes": [
"pulse_salience_audio",
"beat_consistency",
"syncopation_audio",
"offbeat_weight_share",
"onset_density_per_s",
"percussive_energy_share",
"low_band_pulse_regularity"
],
"classes": {
"BATTLE": {
"pulse_salience_audio": {
"n": 5,
"p10": 0.2795,
"p50": 0.4083,
"p90": 0.4525
},
"beat_consistency": {
"n": 5,
"p10": 0.9402,
"p50": 0.9605,
"p90": 0.9734
},
"syncopation_audio": {
"n": 5,
"p10": 0.0267,
"p50": 0.1333,
"p90": 0.1733
},
"offbeat_weight_share": {
"n": 5,
"p10": 0.16,
"p50": 0.5125,
"p90": 0.5667
},
"onset_density_per_s": {
"n": 5,
"p10": 0.2533,
"p50": 0.7331,
"p90": 3.1523
},
"percussive_energy_share": {
"n": 5,
"p10": 0.1323,
"p50": 0.1972,
"p90": 0.2574
},
"low_band_pulse_regularity": {
"n": 5,
"p10": 0.0931,
"p50": 0.1488,
"p90": 0.2187
}
},
"EXPLORATION": {
"pulse_salience_audio": {
"n": 8,
"p10": 0.1527,
"p50": 0.2883,
"p90": 0.518
},
"beat_consistency": {
"n": 8,
"p10": 0.9467,
"p50": 0.9793,
"p90": 0.9833
},
"syncopation_audio": {
"n": 8,
"p10": 0.0,
"p50": 0.05,
"p90": 0.1733
},
"offbeat_weight_share": {
"n": 8,
"p10": 0.2933,
"p50": 0.4,
"p90": 0.4657
},
"onset_density_per_s": {
"n": 8,
"p10": 0.5667,
"p50": 2.1091,
"p90": 3.4283
},
"percussive_energy_share": {
"n": 8,
"p10": 0.0289,
"p50": 0.072,
"p90": 0.2467
},
"low_band_pulse_regularity": {
"n": 8,
"p10": 0.0623,
"p50": 0.1275,
"p90": 0.1883
}
},
"POOLED_ALL_CLASSES": {
"pulse_salience_audio": {
"n": 30,
"p10": 0.0789,
"p50": 0.2631,
"p90": 0.5011
},
"beat_consistency": {
"n": 30,
"p10": 0.9294,
"p50": 0.9552,
"p90": 0.9833
},
"syncopation_audio": {
"n": 30,
"p10": 0.0,
"p50": 0.0667,
"p90": 0.2
},
"offbeat_weight_share": {
"n": 30,
"p10": 0.2,
"p50": 0.4,
"p90": 0.535
},
"onset_density_per_s": {
"n": 30,
"p10": 0.3579,
"p50": 0.9308,
"p90": 3.3591
},
"percussive_energy_share": {
"n": 30,
"p10": 0.0247,
"p50": 0.115,
"p90": 0.2779
},
"low_band_pulse_regularity": {
"n": 30,
"p10": 0.0643,
"p50": 0.1181,
"p90": 0.2188
}
}
}
},
"stats": {
"pulse_salience_audio": {
"within_album_auc": 0.4761904761904762,
"hits_used": 28,
"siblings_used": 159,
"deviation": 0.02380952380952378,
"hit_median": 0.2631,
"hit_p10": 0.0789,
"hit_p90": 0.5011,
"sibling_median": 0.3122,
"round1_median": 0.1856,
"round2_median": 0.3916,
"round3_median": 0.4137,
"auc_hits_over_round1": 0.6322916666666667,
"auc_hits_over_round2": 0.28888888888888886,
"auc_hits_over_round3": 0.2222222222222222,
"n_hits": 30,
"n_siblings": 93,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": -0.0243,
"spearman_vs_voiced_fraction": -0.3096,
"n_confound_pairs": 161
},
"beat_consistency": {
"within_album_auc": 0.4720238095238095,
"hits_used": 28,
"siblings_used": 159,
"deviation": 0.027976190476190488,
"hit_median": 0.9552,
"hit_p10": 0.9294,
"hit_p90": 0.9833,
"sibling_median": 0.9606,
"round1_median": 0.9573,
"round2_median": 0.9834,
"round3_median": 0.982,
"auc_hits_over_round1": 0.5645833333333333,
"auc_hits_over_round2": 0.17777777777777778,
"auc_hits_over_round3": 0.18888888888888888,
"n_hits": 30,
"n_siblings": 93,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": 0.0346,
"spearman_vs_voiced_fraction": -0.0344,
"n_confound_pairs": 161
},
"syncopation_audio": {
"within_album_auc": 0.4473214285714286,
"hits_used": 28,
"siblings_used": 157,
"deviation": 0.05267857142857141,
"hit_median": 0.0667,
"hit_p10": 0.0,
"hit_p90": 0.2,
"sibling_median": 0.1333,
"round1_median": 0.0667,
"round2_median": 0.0667,
"round3_median": 0.0667,
"auc_hits_over_round1": 0.49583333333333335,
"auc_hits_over_round2": 0.6388888888888888,
"auc_hits_over_round3": 0.5333333333333333,
"n_hits": 30,
"n_siblings": 92,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": -0.1571,
"spearman_vs_voiced_fraction": -0.1459,
"n_confound_pairs": 160
},
"offbeat_weight_share": {
"within_album_auc": 0.48392857142857143,
"hits_used": 28,
"siblings_used": 157,
"deviation": 0.01607142857142857,
"hit_median": 0.4,
"hit_p10": 0.2,
"hit_p90": 0.535,
"sibling_median": 0.4,
"round1_median": 0.4,
"round2_median": 0.3667,
"round3_median": 0.4,
"auc_hits_over_round1": 0.4947916666666667,
"auc_hits_over_round2": 0.6055555555555555,
"auc_hits_over_round3": 0.4166666666666667,
"n_hits": 30,
"n_siblings": 92,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": 0.0194,
"spearman_vs_voiced_fraction": -0.1883,
"n_confound_pairs": 160
},
"onset_density_per_s": {
"within_album_auc": 0.45416666666666666,
"hits_used": 28,
"siblings_used": 159,
"deviation": 0.04583333333333334,
"hit_median": 0.9308,
"hit_p10": 0.3579,
"hit_p90": 3.3591,
"sibling_median": 1.25,
"round1_median": 1.1334,
"round2_median": 1.2333,
"round3_median": 2.3167,
"auc_hits_over_round1": 0.44583333333333336,
"auc_hits_over_round2": 0.34444444444444444,
"auc_hits_over_round3": 0.25555555555555554,
"n_hits": 30,
"n_siblings": 93,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": 0.1664,
"spearman_vs_voiced_fraction": -0.1373,
"n_confound_pairs": 161
},
"percussive_energy_share": {
"within_album_auc": 0.4199404761904762,
"hits_used": 28,
"siblings_used": 159,
"deviation": 0.0800595238095238,
"hit_median": 0.115,
"hit_p10": 0.0247,
"hit_p90": 0.2779,
"sibling_median": 0.1471,
"round1_median": 0.0659,
"round2_median": 0.0571,
"round3_median": 0.0803,
"auc_hits_over_round1": 0.5578125,
"auc_hits_over_round2": 0.6888888888888889,
"auc_hits_over_round3": 0.6888888888888889,
"n_hits": 30,
"n_siblings": 93,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": -0.2935,
"spearman_vs_voiced_fraction": -0.7112,
"n_confound_pairs": 161
},
"low_band_pulse_regularity": {
"within_album_auc": 0.5494047619047618,
"hits_used": 28,
"siblings_used": 159,
"deviation": 0.04940476190476184,
"hit_median": 0.1181,
"hit_p10": 0.0643,
"hit_p90": 0.2188,
"sibling_median": 0.1047,
"round1_median": 0.0869,
"round2_median": 0.1297,
"round3_median": 0.1559,
"auc_hits_over_round1": 0.6479166666666667,
"auc_hits_over_round2": 0.4444444444444444,
"auc_hits_over_round3": 0.35555555555555557,
"n_hits": 30,
"n_siblings": 93,
"n_r1": 32,
"n_r2": 3,
"n_r3": 3,
"spearman_vs_note_count": 0.0323,
"spearman_vs_voiced_fraction": -0.2036,
"n_confound_pairs": 161
}
},
"verdicts": {
"pulse_salience_audio": {
"verdict": "DEFECT-DETECTOR-ONLY",
"why": "does NOT clear the within-album bar (deviation 0.0238 against 0.1833), but separates the corpus from our own generated rounds at AUC r1 0.632, r2 0.289, r3 0.222",
"worst_density_spearman": 0.3096
},
"beat_consistency": {
"verdict": "DEFECT-DETECTOR-ONLY",
"why": "does NOT clear the within-album bar (deviation 0.028 against 0.1833), but separates the corpus from our own generated rounds at AUC r1 0.565, r2 0.178, r3 0.189",
"worst_density_spearman": 0.0346
},
"syncopation_audio": {
"verdict": "NULL",
"why": "neither within-album (deviation 0.0527 vs 0.1833) nor against our own rounds (best AUC deviation 0.139). Reported as a null, in those words.",
"worst_density_spearman": 0.1571
},
"offbeat_weight_share": {
"verdict": "NULL",
"why": "neither within-album (deviation 0.0161 vs 0.1833) nor against our own rounds (best AUC deviation 0.106). Reported as a null, in those words.",
"worst_density_spearman": 0.1883
},
"onset_density_per_s": {
"verdict": "NULL",
"why": "neither within-album (deviation 0.0458 vs 0.1833) nor against our own rounds (best AUC deviation 0.244). Reported as a null, in those words.",
"worst_density_spearman": 0.1664
},
"percussive_energy_share": {
"verdict": "NULL",
"why": "neither within-album (deviation 0.0801 vs 0.1833) nor against our own rounds (best AUC deviation 0.189). Reported as a null, in those words. CONFOUND: |Spearman| 0.711 against note count / voiced fraction -- this axis is largely density wearing a rhythm name.",
"worst_density_spearman": 0.7112
},
"low_band_pulse_regularity": {
"verdict": "NULL",
"why": "neither within-album (deviation 0.0494 vs 0.1833) nor against our own rounds (best AUC deviation 0.148). Reported as a null, in those words.",
"worst_density_spearman": 0.2036
}
},
"multiplicity_null": {
"n_perm": 300,
"median": 0.11419753086419754,
"p90": 0.16327160493827164,
"p95": 0.18333333333333335,
"p99": 0.2160493827160494,
"max": 0.3
},
"clears_multiplicity_bar": [],
"round_3_outside_bands": [
{
"cue": "PASS5_FLORES_FALLS",
"class": "SANCTUARY",
"axis": "offbeat_weight_share",
"value": 0.5429,
"band_class": "POOLED_ALL_CLASSES",
"n": 30,
"p10": 0.2,
"p50": 0.4,
"p90": 0.535,
"direction": "ABOVE p90",
"verdict": "NULL"
},
{
"cue": "PASS5_FLORES_FALLS",
"class": "SANCTUARY",
"axis": "percussive_energy_share",
"value": 0.0126,
"band_class": "POOLED_ALL_CLASSES",
"n": 30,
"p10": 0.0247,
"p50": 0.115,
"p90": 0.2779,
"direction": "BELOW p10",
"verdict": "NULL"
},
{
"cue": "PASS5_FLORES_ROUNDS",
"class": "BATTLE",
"axis": "pulse_salience_audio",
"value": 0.4909,
"band_class": "BATTLE",
"n": 5,
"p10": 0.2795,
"p50": 0.4083,
"p90": 0.4525,
"direction": "ABOVE p90",
"verdict": "DEFECT-DETECTOR-ONLY"
},
{
"cue": "PASS5_FLORES_ROUNDS",
"class": "BATTLE",
"axis": "beat_consistency",
"value": 0.9861,
"band_class": "BATTLE",
"n": 5,
"p10": 0.9402,
"p50": 0.9605,
"p90": 0.9734,
"direction": "ABOVE p90",
"verdict": "DEFECT-DETECTOR-ONLY"
},
{
"cue": "PASS5_FLORES_ROUNDS",
"class": "BATTLE",
"axis": "percussive_energy_share",
"value": 0.1224,
"band_class": "BATTLE",
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"track_id": "NOCORPUS__SLICE_T4_MELANCHOLIC_HOME_AND_LOSS_b_44011",
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"track_id": "NOCORPUS__SLICE_T4_MELANCHOLIC_HOME_AND_LOSS_b_44022",
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"track_id": "NOCORPUS__SLICE_T4_MELANCHOLIC_HOME_AND_LOSS_b_44033",
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{
"track_id": "NOCORPUS__SLICE_T4_MELANCHOLIC_HOME_AND_LOSS_b_44044",
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"track_id": "PASS2_FLORES_REST",
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{
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],
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{
"track_id": "PASS5_FLORES_FALLS",
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"track_id": "PASS5_FLORES_ROAD",
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{
"track_id": "PASS5_FLORES_ROUNDS",
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],
"score_tier": {
"note": "The corpus is audio only; no score-tier band exists and none is invented. These are our own rounds measured against each other and against the symbolic ceiling of 1.0.",
"rows": [
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}