Chord Distribution Analysis

Chord SymbolCountFrequency
Gm1957.6%
C7412.1%
Cm7412.1%
Eb726.1%
D726.1%
F713.0%
E713.0%

Key Patterns Detected

PatternFunctionFrequency
Gm -> C7Setup (Major Key)1
D7 -> GmResolution (Minor)1

Harmonic Highlights

  • Static Modal Foundation: The composition utilizes an extended 12-bar G minor section, emphasizing modal stability and requiring internal melodic tension over functional movement.
  • IV-Chord Oscillation: The shift between C7 and Cm7 creates a Mixolydian-to-Dorian modal interchange, frequently alternating the major and minor third of the IV chord.
  • Pentatonic Shifting: The repetitive Gm framework encourages “side-slipping” or chromatic transposition of pentatonic scales (e.g., Ab minor over Gm) to create modern harmonic friction.

Improvisation Focus G Dorian scale (G-A-Bb-C-D-E-F), as the natural 6th (E) provides the necessary color for the G minor pedal and functions as the major 3rd of the C7 chord.

Difficulty Rating 3/5 (Intermediate): The challenge lies in sustaining melodic interest over static harmony rather than navigating complex, rapid chord changes.


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The Real Book - Volume IV
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