Chord Distribution Analysis

Chord SymbolCountFrequency
F7715.2%
Abmaj7510.9%
Cm7510.9%
Bbm748.7%
Eb748.7%
G736.5%
C724.3%
Ab7#524.3%

Key Patterns Detected

PatternFunctionFrequency
Bbm7 -> Eb7Setup (Major Key)4
Eb7 -> Abmaj7Resolution (Major)4
Cm7 -> F7Setup (Major Key)3
F7 -> Bbm7Resolution (Minor)3
G7 -> Cm7Resolution (Minor)2
Cm7b5/Eb -> F7Setup (Minor Key)2
F7 -> Cm7Resolution (Minor)1
F#m7 -> B7Setup (Major Key)1
Dm7 -> G7Setup (Major Key)1
Dbm7 -> Gb7Setup (Major Key)1
Bm7 -> E7Setup (Major Key)1

Harmonic Highlights

  • Features a sophisticated Ab “Rhythm Changes” variation, utilizing a dense III-VI-II-V cycle (C7-F7-Bbm7-Eb7) to drive chromatic harmonic motion.
  • Employs “side-slipping” via the F#m7-B7 sequence, functioning as a tritone substitution (subV/ii) to approach the Bbmaj7/Bbm7 tonal area.
  • The bridge utilizes a subdominant shift to Db7 followed by a D°7 passing chord, creating a classic #iv diminished ascent toward the iii-VI turnaround.

Improvisation Focus Mastery of Linear Bebop Phrasing and the Ab Major/Dominant Bebop scales to navigate rapid, non-diatonic ii-V progressions.

Difficulty Rating 4/5: The high-speed harmonic rhythm and abrupt shifts in tonal center demand advanced technical facility and melodic precision to maintain continuity.


📚 Standard Available in:

The Real Book - Volume II
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