Chord Distribution Analysis

Chord SymbolCountFrequency
A7#9318.8%
Dm6318.8%
Gm6212.5%
Dm7212.5%
Db716.2%
Cm716.2%
F716.2%
Bbmaj7#1116.2%

Key Patterns Detected

PatternFunctionFrequency
A7#9 -> Dm6Resolution (Minor)2
A7#9 -> Dm7Resolution (Minor)1
Cm7 -> F7Setup (Major Key)1
F7 -> Bbmaj7#11Resolution (Major)1
E7b13 -> Am7Resolution (Minor)1

Harmonic Highlights

  • The chromatic sequence Dm7 - Db7 - Cm7 utilizes Db7 as a tritone substitute for G7, functioning as a dominant approach to the ii-V-I in Bb Major.
  • A unique 10-measure circular structure deviates from standard 12 or 32-bar forms, creating an impressionistic, “endless” loop without a traditional resolution.
  • The Bbmaj7#11 chord introduces Lydian color, providing a bright, ethereal harmonic contrast to the dark D minor tonality.

Improvisation Focus D Dorian and D Aeolian modes, emphasizing the melodic exploitation of upper-structure extensions (9ths, 11ths, 13ths) and space.

Difficulty Rating 4/5; the unconventional 10-bar phrasing and slow tempo demand advanced spatial awareness and sophisticated melodic restraint.


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The Real Book - Volume I
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