Chord Distribution Analysis

Chord SymbolCountFrequency
Bb13642.9%
Eb13321.4%
Eb717.1%
Ab1317.1%
G7#517.1%
Cm917.1%
F1317.1%

Key Patterns Detected

PatternFunctionFrequency
G7#5 -> Cm9Resolution (Minor)1

Harmonic Highlights:

  • Utilizes a modified 12-bar blues framework featuring dominant 13th extensions (Bb13, Eb13) typical of the Hard Bop era.
  • Incorporates a chromatic “backdoor” approach using Ab13 (bVII13) to lead into the G7#5 (VI7alt) turnaround, adding harmonic depth to the standard blues progression.
  • Employs a functional ii-V cadence (Cm9 to F13) in the final bars to provide a clean resolution back to the tonic Bb major center.
  1. Improvisation Focus: Bb Blues scale combined with chord-tone targeting for the altered VI7 turnaround.

  2. Difficulty Rating: 2/5; while the blues structure is fundamental and accessible, the chromaticism in bars 9–10 requires specific attention to altered dominant extensions.


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The Real Book - Volume II
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