Chord Distribution Analysis

Chord SymbolCountFrequency
Bb7514.7%
Ab6514.7%
Eb7411.8%
Db6411.8%
Gb738.8%
F738.8%
Ebm725.9%
Ab725.9%

Key Patterns Detected

PatternFunctionFrequency
Ebm7 -> Ab7Setup (Major Key)2
Dbm7 -> Gb7Setup (Major Key)2
Bbm7 -> Eb7Setup (Major Key)1

Harmonic Highlights

  • Starts with a II7-V7-I sequence (Bb7-Eb7-Ab6), utilizing a secondary dominant (V7/V) to create immediate harmonic tension and forward momentum.
  • Employs a tonicization of the IV chord (Db6) via a related ii-V (Ebm7-Ab7), a hallmark of the early swing era.
  • Features a “back-door” resolution or subdominant minor movement (Dbm7-Gb7) providing a sophisticated chromatic return to the tonic Abmaj7.
  • The progression relies heavily on the cycle of fifths (F7-Bb7-Eb7-Ab), creating a predictable but effective structural foundation.

Improvisation Focus Chord tone targeting and 3-7 voice leading, particularly when navigating the transition from the II7 (Bb7) to the V7 (Eb7).

Difficulty Rating 2/5 β€” The harmonic rhythm is steady and the cycle-of-fifths movements are diatonic enough for intermediate soloists to navigate comfortably.


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The Real Book - Volume III
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