Chord Distribution Analysis

Chord SymbolCountFrequency
Fm7617.1%
E7514.3%
Bb7411.4%
Ebmaj738.6%
Abmaj7#1125.7%
G25.7%
Eb725.7%
Gm712.9%

Key Patterns Detected

PatternFunctionFrequency
Fm7 -> Bb7Setup (Major Key)4
Bb7 -> Fm7Resolution (Minor)2
Am7 -> D7Setup (Major Key)1
Bbm7 -> Eb7Setup (Major Key)1
C7b9 -> Fm7Resolution (Minor)1

Harmonic Highlights

  • Utilizes frequent tritone substitutions, specifically replacing the dominant Bb7 with E7 to create descending chromatic resolutions (Fm7 - E7 - Ebmaj7).
  • Features a “Rhythm Changes” skeleton heavily modified with secondary II-Vs, such as the Am7 - D7 leading to a temporary G major (III) tonal center.
  • Incorporates constant IV chord color shifts, utilizing Abmaj7#11 to provide a Lydian modal flavor within a functional bebop framework.
  • The progression employs rapid “side-slipping” dominant chords, requiring the soloist to navigate half-step shifts while maintaining the Eb major home key.

Improvisation Focus Chromatic voice-leading over tritone substitutions.

Difficulty Rating 4 (Advanced) - The fast-moving chromatic substitutions and frequent modulations require high-level linear facility and precise targeting of non-diatonic chord tones.