Chord Distribution Analysis

Chord SymbolCountFrequency
Am420.0%
Cm315.0%
Cm715.0%
F715.0%
Bbmaj715.0%
Bbm715.0%
Eb715.0%
Abmaj715.0%

Key Patterns Detected

PatternFunctionFrequency
Cm7 -> F7Setup (Major Key)1
F7 -> Bbmaj7Resolution (Major)1
Bbm7 -> Eb7Setup (Major Key)1
Eb7 -> Abmaj7Resolution (Major)1
Abm7 -> Db7Setup (Major Key)1
Db7 -> Gbmaj7Resolution (Major)1
Gm7 -> C7Setup (Major Key)1
C7 -> Fmaj7Resolution (Major)1

Harmonic Highlights

  • The initial shift from Am to Cm creates a non-functional modal opening that subverts traditional diatonic expectations in F major.
  • A sequence of ii-V-I progressions descends chromatically by minor thirds (Bb, Ab, Gb), requiring rapid adjustment to shifting tonal centers.
  • The structure utilizes “constant structures,” where the same harmonic relationship is transposed to different pitch levels to create modern tension.
  • Final resolution occurs via a standard ii-V-I (Gm7-C7-Fmaj7), providing a grounding return to the tonic after the chromatic mid-section.

Improvisation Focus Smoothly navigating descending ii-V-I cells by connecting 3rd and 7th guide tones.

Difficulty Rating 3/5. While the tempo is often moderate, the challenge lies in maintaining melodic continuity through three rapid, non-diatonic key changes.


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The Real Book - Volume I
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