Chord Distribution Analysis

Chord SymbolCountFrequency
Gmaj7822.9%
Am7822.9%
Eb7411.4%
E7b9411.4%
Bm738.6%
D738.6%
Bbm725.7%
Cm612.9%

Key Patterns Detected

PatternFunctionFrequency
E7b9 -> Am7Resolution (Minor)4
Am7 -> D7Setup (Major Key)3
Bbm7 -> Eb7Setup (Major Key)2
Bm7 -> E7b9Setup (Major Key)2
Am7 -> E7b9Setup (Major Key)2
D7 -> Gmaj7Resolution (Major)1

Harmonic Highlights:

  • Sudden side-stepping from the tonic (Gmaj7) to a non-diatonic ii-V (Bbm7โ€“Eb7) in measure three, creating a dramatic bIII7 harmonic shift.
  • Frequent use of secondary dominant cycles (Bm7โ€“E7b9) to tonicize the ii chord (Am7).
  • Employment of the “backdoor” dominant (Eb7) to create chromatic tension before resolving back toward the G major tonic or the ii chord.

Improvisation Focus: Arpeggio-based voice leading to highlight the transitions between the G major scale and the non-diatonic Bbm7-Eb7 cell.

Difficulty Rating: 3/5: While the tempo is usually accessible, the unexpected chromatic modulations require precise navigation of chord tones rather than simple scale running.


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The Real Book - Volume I
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