Chord Distribution Analysis

Chord SymbolCountFrequency
Fmaj7310.7%
D7310.7%
G7310.7%
Cmaj727.1%
Gb7#1127.1%
Em7b527.1%
A7b927.1%
Dm727.1%

Key Patterns Detected

PatternFunctionFrequency
Em7b5 -> A7b9Setup (Minor Key)2
Dm7 -> G7Setup (Major Key)2
Am7 -> D7Setup (Major Key)1
Gm7 -> C7Setup (Major Key)1
C7 -> Fmaj7Resolution (Major)1
Fmaj7 -> Bb7Setup (Major Key)1
Em7 -> A7Setup (Major Key)1
G7#5 -> Cmaj7Resolution (Major)1
A7b9 -> Dm7Resolution (Minor)1

Harmonic Highlights

  • Frequent use of tritone substitution, specifically Gb7#11 acting as a subV/IV to lead smoothly into Fmaj7.
  • Minor ii-V motion (Em7b5 – A7b9) targeting the supertonic (Dm7), introducing harmonic tension typically found in minor keys.
  • Secondary dominant cycles (Am7 – D7 – Dm7 – G7) create a strong pull through the circle of fifths toward the tonic.
  • The “backdoor” dominant (Bb7) provides a sophisticated chromatic resolution to the tonic or tonic substitute (Em7).

Improvisation Focus Guide-tone voice leading to navigate the frequent shifts between diatonic C major and chromatic secondary dominants.

Difficulty Rating 3/5. While the key center remains stable, the player must master tritone substitutions and minor ii-V-I patterns to play effectively over the changes.


πŸ“š Standard Available in:

The Real Vocal Book - Volume IV
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