VERIFY.md

Verification report

Gold gate (dual-derivation agreement)

metric	value
distinct shapes	845
instances (shape x key)	5715
instances dropped	0
chords attempted	27480
chord disagreements	0
chord agreement rate	100.000%
total records	21940

Distribution

• by source: {'curated': 230, 'single': 1440, 'grammar': 20270}
• by cadence: {'PAC': 7902, 'HC': 3903, None: 1458, 'DC': 4460, 'IAC': 3645, 'PC': 572}

Same progression, four framings (brief example in C major)

• symbol_to_rn
  • in: key: C major // progression: Dm7 G7 Cmaj7
  • out: ii7 V7 IM7 // cadence: PAC
• notes_to_rn
  • in: key: C major // notes: D4 F4 A4 C5 | G4 B4 D5 F5 | C4 E4 G4 B4
  • out: ii7 V7 IM7 // cadence: PAC
• pcset_to_rn
  • in: key: C major // pitch classes: [2 5 9 0] | [7 11 2 5] | [0 4 7 11]
  • out: ii7 V7 IM7 // cadence: PAC
• key_id
  • in: notes: D4 F4 A4 C5 | G4 B4 D5 F5 | C4 E4 G4 B4
  • out: C major

Grammar phrases (notes_to_rn, in C major / A minor)

• A minor A4 C5 E5 | D5 F5 A5 | B4 D5 G#5 | E5 G#5 B5 D6 | F5 A5 C6 -> i iv viio6 V7 VI (DC)
• A minor A4 C5 E5 | C5 E5 A5 | D5 F5 B5 | E5 G#5 B5 -> i i6 iio6 V (HC)
• C major C4 E4 G4 | F4 A4 D5 | G4 C5 E5 | G4 B4 D5 -> I ii6 I64 V (HC)
• A minor A4 C5 E5 | A4 C#5 E5 G5 | D5 F5 A5 | E5 G#5 B5 -> i V7/iv iv V (HC)
• A minor A4 C5 E5 | F5 A5 C6 | B4 D5 F5 A5 | E5 G#5 B5 D6 | F5 A5 C6 -> i VI ii%7 V7 VI (DC)
• C major C4 E4 G4 | D4 F4 A4 C5 | D4 F4 B4 | G4 B4 D5 F5 | A4 C5 E5 -> I ii7 viio6 V7 vi (DC)
• C major C4 E4 G4 | E4 G4 B4 | A4 C5 E5 | F4 A4 C5 | G4 B4 D5 -> I iii vi IV V (HC)
• A minor A4 C5 E5 | C5 E5 A5 | D5 F5 A5 | E5 G#5 B5 -> i i6 iv V (HC)
• A minor C5 E5 A5 | D5 F5 A5 | D5 F5 B5 | E5 G#5 B5 | A4 C5 E5 -> i6 iv iio6 V i (PAC)
• A minor A4 C5 E5 | C5 E5 A5 | D5 F5 A5 | B4 D5 G#5 | E5 G#5 B5 D6 | F5 A5 C6 -> i i6 iv viio6 V7 VI (DC)
• A minor A4 C5 E5 | F5 A5 C6 | C5 E5 G5 | D5 F5 A5 | E5 G#5 B5 | F5 A5 C6 -> i VI III iv V VI (DC)
• A minor A4 C5 E5 | F5 A5 C6 | D5 F5 A5 | E5 G#5 B5 -> i VI iv V (HC)