Chord Distribution Analysis

Chord SymbolCountFrequency
Bb6820.0%
F9sus717.5%
Eb7#11410.0%
Cm737.5%
Cm925.0%
F7b925.0%
G7b925.0%
Ebmaj912.5%

Key Patterns Detected

PatternFunctionFrequency
Dm7b5 -> G7b9Setup (Minor Key)1
G7b9 -> Cm7Resolution (Minor)1
Cm7 -> G7b13Setup (Major Key)1
G7b13 -> Cm7Resolution (Minor)1
Em7b5 -> A7b9Setup (Minor Key)1
Am7b5 -> D7b13Setup (Minor Key)1
Ebmaj7 -> Ab7Setup (Major Key)1

Harmonic Highlights

  • The composition frequently employs the IV7 (Eb7#11) as a subdominant color, utilizing the Lydian Dominant sound to provide a sophisticated “backdoor” flavor despite the Bb major tonic.
  • Strong secondary tonicization occurs via minor ii-V-i cells, specifically Dm7b5–G7b9 leading to Cm7, which emphasizes the supertonic (ii) region.
  • The dominant tension is varied through the use of F9sus and F7b9, creating a shift from open, modal textures to high-tension altered resolutions back to Bb6.
  • Brief excursions into the relative minor (G minor) are suggested through the Em7b5–A7b9 sequence, functioning as a secondary ii-V to the iii (Dm) or vi.

Improvisation Focus Chord Tone Targeting and Guide Tone Voice Leading through the shifting major and minor ii-V-I cells.

Difficulty Rating 3 (Intermediate). While the slow ballad tempo provides space, the frequent minor ii-V movements and altered dominant colors require precise harmonic navigation.


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The Real Book - Volume VI
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