Chord Distribution Analysis

Chord SymbolCountFrequency
Gm7717.5%
Fm7410.0%
Bb7sus410.0%
D7b9410.0%
Ebmaj725.0%
Gb0725.0%
Bbm725.0%
Eb725.0%

Key Patterns Detected

PatternFunctionFrequency
D7b9 -> Gm7Resolution (Minor)4
Gm7 -> D7b9Setup (Major Key)3
Fm7 -> Bb7susSetup (Major Key)2
Bbm7 -> Eb7Setup (Major Key)2
Am7b5 -> D7b9Setup (Minor Key)1
Gm7 -> C7Setup (Major Key)1
Bb7sus -> Ebmaj7Resolution (Major)1
Eb7 -> Abmaj7Resolution (Major)1

Harmonic Highlights

  • Employs a chromatic $Gb^{\circ}7$ passing chord to facilitate a smooth functional descent from $Gm7$ (iii) to $Fm7$ (ii) within the A section.
  • The bridge shifts to the relative minor ($Gm$) using repetitive $ii-V-i$ sequences ($Am7b5$ - $D7b9$ - $Gm7$), demanding distinct minor-tonality navigation.
  • Utilizes a $C7$ secondary dominant ($V/V$) to build tension for the turnaround back to the primary $Bb$ major tonic.

Improvisation Focus: Bb Major Bebop Scale and G Melodic Minor, emphasizing smooth voice-leading over the minor $ii-V$ transitions in the bridge.

Difficulty Rating: 3 (Intermediate). While the primary key is stable, the frequent minor-key modulations and chromatic passing chords require an intermediate understanding of tonal centers.


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The Real Book - Volume VI
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