Chord Distribution Analysis

Chord SymbolCountFrequency
Bbmaj7417.4%
Eb7417.4%
Cm7313.0%
F7313.0%
Ebmaj728.7%
Bb628.7%
Fm714.3%
Bb714.3%

Key Patterns Detected

PatternFunctionFrequency
Cm7 -> F7Setup (Major Key)3
Bbmaj7 -> Eb7Setup (Major Key)2
Fm7 -> Bb7Setup (Major Key)1
Bb7 -> Ebmaj7Resolution (Major)1
Ebm7 -> Ab7Setup (Major Key)1
Ab7 -> Dbmaj7Resolution (Major)1
F7 -> Bbmaj7Resolution (Major)1

Harmonic Highlights

  • The A section centers on a Imaj7 to IV7 (Bbmaj7 to Eb7) progression, where the Eb7 functions as a blues-inflected “swing” IV chord rather than a functional dominant.
  • The bridge utilizes sequential ii-V-I modulations, descending by a whole step from Eb major (Fm7–Bb7–Ebmaj7) to Db major (Ebm7–Ab7–Dbmaj7).
  • Structural continuity is maintained through standard ii-V turnarounds (Cm7–F7) that reinforce the tonic Bb major throughout the head.
  1. Improvisation Focus Navigating the descending ii-V-I sequences in the bridge by targeting the 3rds and 7ths of each changing key center.

  2. Difficulty Rating 3/5; while the A section is harmonically stable, the bridge requires fluid transposition of melodic patterns through two distinct, non-diatonic keys.


📚 Standard Available in:

The Real Book - Volume I
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