Chord Distribution Analysis

Chord SymbolCountFrequency
Am7713.5%
Dm7713.5%
G7713.5%
Cmaj747.7%
Fmaj735.8%
C635.8%
Eb0735.8%
C#0723.8%

Key Patterns Detected

PatternFunctionFrequency
Dm7 -> G7Setup (Major Key)6
G7 -> Cmaj7Resolution (Major)3

Harmonic Highlights

  • Frequent use of diminished passing chords (C#o7, F#o7, Ebo7) provides chromatic connectivity between standard diatonic pivots like Dm7 and Am7.
  • The Bb7#11 acts as a “back-door” dominant (bVII7), introducing Lydian Dominant colors that resolve smoothly to the tonic C major.
  • Altered secondary dominants (C7#5, E7#5) facilitate voice-led transitions into the IV (Fmaj7) and vi (Am7) chords.
  • The progression utilizes chromatic bass movement and tonic inversions (Cmaj7/E) to create a sophisticated, linear harmonic flow typical of Rodgers’ ballads.

Improvisation Focus C Major scale combined with Diminished Arpeggios to navigate chromatic passing tones.

Difficulty Rating 3/5: While the home key is C major, the frequent chromatic substitutions and altered dominants require precise guide-tone navigation and melodic flexibility.


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The Real Book - Volume I
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