Chord Distribution Analysis

Chord SymbolCountFrequency
Cm7210.0%
F7210.0%
Bbm7210.0%
Eb7210.0%
Abmaj715.0%
Gm7b515.0%
C7b915.0%
Fm715.0%

Key Patterns Detected

PatternFunctionFrequency
Cm7 -> F7Setup (Major Key)2
Bbm7 -> Eb7Setup (Major Key)2
Gm7b5 -> C7b9Setup (Minor Key)1
C7b9 -> Fm7Resolution (Minor)1
Ebm7 -> Ab7Setup (Major Key)1
Ab7 -> Dbmaj7Resolution (Major)1
Dbm7 -> Gb7Setup (Major Key)1
Bm7 -> E7Setup (Major Key)1
F7 -> Bbm7Resolution (Minor)1

Harmonic Highlights

  • Employs “Bird Blues” architecture, featuring a minor ii-V (Gm7b5–C7b9) to the vi chord (Fm7) and a secondary ii-V (Ebm7–Ab7) to reach the IV chord (Dbmaj7).
  • Utilizes sequential, descending ii-V patterns (Cm7–F7 to Bm7–E7 to Bbm7–Eb7) that move chromatically and through the cycle of fifths to return to the tonic.
  • Features a “backdoor” ii-V (Dbm7–Gb7) acting as a sub-dominant minor substitution to bridge the IV chord back to the iii–VI–ii–V turnaround.

Improvisation Focus Voice-led navigation of descending ii-V sequences using chromatic guide tones.

Difficulty Rating 4 - The rapid harmonic rhythm and non-diatonic shifts through unrelated keys require high-level proficiency in connecting melodic cells across changing tonal centers.