Chord Distribution Analysis

Chord SymbolCountFrequency
Fmaj7822.9%
C7411.4%
Gm7b538.6%
C7b938.6%
Gm738.6%
Amaj738.6%
Bm725.7%
E725.7%

Key Patterns Detected

PatternFunctionFrequency
Gm7b5 -> C7b9Setup (Minor Key)3
C7b9 -> Fmaj7Resolution (Major)3
Gm7 -> C7Setup (Major Key)3
C7 -> Fmaj7Resolution (Major)2
Bm7 -> E7Setup (Major Key)2
E7 -> Amaj7Resolution (Major)2
Am7b5 -> D7b9Setup (Minor Key)2
D7b9 -> Gm7Resolution (Minor)1
C7 -> Gm7b5Resolution (Minor)1

Harmonic Highlights

  • The progression begins with a minor ii-V (Gm7b5 - C7b9) resolving to a major tonic (Fmaj7), utilizing modal mixture to create a dark-to-bright opening.
  • A rapid modulation to A major (the chromatic mediant) occurs via a ii-V (Bm7 - E7), requiring a shift from the flat-side home key to a sharp-side tonality.
  • The structure alternates between the natural ii (Gm7) and the borrowed iiรธ7 (Gm7b5), demanding precise alterations of the 5th and 9th over the C7 dominant.

Improvisation Focus Navigating the abrupt modulation to A major by targeting chord tones and managing the transition between F major and A major scales.

Difficulty Rating 3/5: The unexpected modulation to a distant key and the use of minor ii-V patterns in a major context require intermediate-level harmonic navigation.


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The Real Book - Volume I
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