Chord Distribution Analysis

Chord SymbolCountFrequency
Ebmaj7316.7%
Cm7b5211.1%
Bbmaj7211.1%
F13b915.6%
Eb1315.6%
D7b1315.6%
G915.6%
C1315.6%

Key Patterns Detected

PatternFunctionFrequency
Ebm6 -> Ab7Setup (Major Key)1

Harmonic Highlights

  • Utilizes a minor ii-V (Cm7b5–F13b9) resolving to a major tonic (Bbmaj7), effectively blending parallel minor colors into the Bb major key center.
  • Features an extended dominant cycle (D7–G9–C13) followed by a chromatic side-slip (B13 to Bb13) to transition into the IV chord.
  • Employs a classic backdoor resolution (Ebm6–Ab7 to Bbmaj7), using the minor subdominant to create a sophisticated, dark-to-bright tension release.
  • Incorporates tritone substitution (Db7#11) as a chromatic passing chord to bridge the movement between Dm7 and the returning Cm7b5.

Improvisation Focus

Guide-tone targeting focusing on the 3rds and 7ths to navigate the constant shifts between Bb major and the borrowed Bb parallel minor tonalities.

Difficulty Rating

4/5: The dense chromaticism, rapid non-diatonic dominant chains, and frequent modal interchange require advanced harmonic navigation and precise voice leading.


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The Real Book - Volume III
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