Chord Distribution Analysis

Chord SymbolCountFrequency
Eb6617.6%
Bb7514.7%
C7411.8%
F738.8%
Fm738.8%
Eb738.8%
E738.8%
G725.9%

Key Patterns Detected

PatternFunctionFrequency
Fm7 -> Bb7Setup (Major Key)3
Bbm7 -> Eb7Setup (Major Key)2
Eb7 -> Bbm7Resolution (Minor)1
Bm7 -> E7Setup (Major Key)1
Cm7 -> F7Setup (Major Key)1

Harmonic Highlights

  • Utilizes an accelerated “Rhythm Changes” turnaround (III7–VI7–II7–V7) in the A section, cycling G7–C7–F7–Bb7 to create aggressive forward momentum toward the Eb tonic.
  • The bridge employs chromatic “side-slipping” ii-V cells, shifting from Bbm7–Eb7 (ii-V of Ab) up a half-step to Bm7–E7, creating intense harmonic tension.
  • Extensive use of tritone substitutions, specifically E7 acting as a dominant substitute for Bb7, providing a chromatic approach to the Eb6 resolutions.

Improvisation Focus Whole-tone scales and rhythmic displacement to navigate the angular melody and rapid dominant cycles.

Difficulty Rating 4/5: The head features dense, rhythmically complex sixteenth-note clusters and rapid-fire changes that demand exceptional technical facility and precise timing.