[{"data":1,"prerenderedAt":4},["ShallowReactive",2],{"chart:a-little-chicago-fire":3},"title: A Little Chicago Fire\ncomposer: Frank Foster\nstyle: Medium Swing\nkey: Bb\nform: AABAA, 40 bars\n# analysis: 2026-10-31, rules v2; Bb\n\nsection: A1\n# area: Bb major (A1 1–3)\n1 | Bb69     # tonic: the 4th is in the key\n1 | G7#9     # V7\u002Fii in Bb: the b13 is in the key, b9, #9 and #11 from the symbol\n2 | Cm9      # ii of the ii–V to Bb\n2 | F13      # V7 of Bb: natural tensions\n3 | BbMaj7   # tonic: the 4th is in the key\n# area: Gb major (A1 3–5)\n3 | Db9      # V7 of Gb: natural tensions\n4 | GbMaj7   # tonic: the 4th is in the key\n4 | F13      # extended dominant: V7 of Bb9\n5 | Bb9      # III7 in Gb, not resolving: the b13 is in the key, the 9 from the symbol\n# area: Bb major (A1 5 – A2 3)\n5 | E13      # tritone substitute: resolves down a half step to Eb69\n6 | Eb69     # the E13 before it makes Eb the key of the moment: the 4th is in the key\n6 | Ebm7\u002FAb  # static sus: Mixolydian\n7 | Dm7      # iii: Phrygian, the key's own notes (the ♭2 is a passing note)\n7 | Cm7      # ii of F7#9: Dorian\n8 | F7#9     # V7\u002FI in Bb: b9, #9 and #11 from the symbol\n9 | F9       # V7 in Bb, not resolving: natural tensions\n9 | B69      # ♭II6, borrowed from Bb Phrygian: Lydian (its ♯11 is in the key)\n@ending 1 8\n@ending 2 9\n\nsection: B\n1 | Am7      # a borrowed minor chord: Dorian, its own key\n2 | Ebm7     # ii of Ab13: Dorian\n2 | Ab13     # tritone substitute: resolves down a half step to G13\n3 | G13      # VI7 in Bb, not resolving: the 13 from the symbol\n3 | Ab13     # tritone substitute: resolves down a half step to G13\n4 | G13      # VI7 in Bb, not resolving: the 13 from the symbol\n4 | G7#5     # VI7 in Bb, not resolving: the b13 is in the key, the #11 from the symbol\n5 | Gm7      # vi: Aeolian, the key's own notes (the ♭6 is a passing note)\n6 | Dbm7     # ii of Gb13: Dorian\n6 | Gb13     # tritone substitute: resolves down a half step to F13\n7 | F13      # V7 in Bb, not resolving: natural tensions\n7 | Gb13     # tritone substitute: resolves down a half step to F13\n8 | F13      # V7 in Bb, not resolving: natural tensions\n8 | F7b9     # V7 of Bb: the b9 from the symbol\n\nsection: A2\n1 | Bb69     # tonic: the 4th is in the key\n1 | G+       # from the symbol: augmented\n2 | Cm9      # ii of the ii–V to Bb\n2 | F7b9     # V7 of Bb: the b9 from the symbol\n3 | BbMaj7   # tonic: the 4th is in the key\n# area: Gb major (A2 3–4)\n3 | Db9      # V7 of Gb: natural tensions\n4 | GbMaj7   # tonic: the 4th is in the key\n4 | F7b9     # VII7 in Gb, not resolving: b9 and b13 are in the key\n# area: Bb major (A2 5 – A3 3)\n5 | Bm7      # ii of E9: Dorian\n5 | E9       # tritone substitute: resolves down a half step to Eb69\n6 | Eb69     # the E9 before it makes Eb the key of the moment: the 4th is in the key\n6 | Ebm7\u002FAb  # static sus: Mixolydian\n7 | Dm7      # iii: Phrygian, the key's own notes (the ♭2 is a passing note)\n7 | G7#9     # V7\u002Fii in Bb: the b13 is in the key, b9, #9 and #11 from the symbol\n8 | Cm7      # ii of the ii–V to Bb\n8 | F9       # V7 of Bb: natural tensions\n8 | Bb69     # tonic: the 4th is in the key\n\nsection: A3\ncopy: A2\n",1793575880181]