Chord Distribution Analysis

Chord SymbolCountFrequency
Cm417.4%
G7/B28.7%
Bbm628.7%
Dm7b528.7%
G7b928.7%
F/A14.3%
Abm614.3%
D714.3%

Key Patterns Detected

PatternFunctionFrequency
Dm7b5 -> G7b9Setup (Minor Key)2
Cm -> G7/BSetup (Major Key)1
Fm7 -> Bb7Setup (Major Key)1
Bb7 -> Ebmaj7Resolution (Major)1
Am7b5 -> D7b9Setup (Minor Key)1
D7b9 -> Gm7Resolution (Minor)1

Harmonic Highlights

  • The progression features a sophisticated descending chromatic bass line (C-B-Bb-A) moving from Cm through Bbm6 to F/A, creating smooth linear tension.
  • The Abm6 chord functions as a minor plagal substitute (ivm6), providing a dark, romantic transition back to the C minor tonic.
  • Golson utilizes a pivot to the relative major (Eb) via a classic ii-V-I-IV sequence (Fm7-Bb7-Ebmaj7-Abmaj7), a hallmark of the Hard Bop era.
  • The structure incorporates a minor ii-V-i into G minor (Am7b5-D7b9-Gm7), demanding quick mental transposition to a closely related key center.

Improvisation Focus C Melodic Minor and its application over minor ii-V-i sequences.

Difficulty Rating 4/5: The non-diatonic descending chords and frequent modulations between minor and major centers require advanced harmonic navigation and precise voice-leading.