Chord Distribution Analysis

Chord SymbolCountFrequency
Am7b5312.0%
D7b9312.0%
Gm6312.0%
F7312.0%
Bbmaj728.0%
Eb728.0%
Ab7#1128.0%
G728.0%

Key Patterns Detected

PatternFunctionFrequency
Am7b5 -> D7b9Setup (Minor Key)3
D7b9 -> Gm6Resolution (Minor)3
Bbmaj7 -> Eb7Setup (Major Key)2
Cm7 -> F7Setup (Major Key)2
Gm6 -> C7Setup (Major Key)1
F7 -> Bbmaj7Resolution (Major)1

Harmonic Highlights

  • Utilizes an Ab7#11 (subV/V) as a tritone substitute to bridge the Eb7 and G7 chords, creating smooth chromatic root movement toward the tonic.
  • Features frequent modal interchange between Bb major (the relative major) and the G minor tonic, shifting functional centers within the A section.
  • Employs repetitive minor ii-V-i sequences (Am7b5 - D7b9 - Gm6) to reinforce the G minor tonality against the swing-style dominant cycles.
  • Integrates a secondary dominant chain (C7 - F7) that functions as a II7 - V7 turnaround to resolve back to the Bbmaj7.

Improvisation Focus Switching between Bb Major and G Melodic Minor, specifically utilizing the G Altered scale over the D7b9 chord.

Difficulty Rating 3/5: Requires fluid navigation between relative major and minor key centers while accurately hitting non-diatonic tritone substitutions.


๐Ÿ“š Standard Available in:

The Real Book - Volume I
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