Chord Distribution Analysis

Chord SymbolCountFrequency
Dmaj7828.6%
Em7/D414.3%
Am7310.7%
A7sus27.1%
Gmaj713.6%
A/G13.6%
Dmaj7/F#13.6%
F7#1113.6%

Key Patterns Detected

PatternFunctionFrequency
F7#11 -> Cmaj7/EResolution (Major)1
F#m7 -> B7Setup (Major Key)1
B7 -> Emaj7Resolution (Major)1
A7 -> Dmaj7Resolution (Major)1
Dmaj7 -> A7susSetup (Major Key)1

Harmonic Highlights

  • The oscillation between Dmaj7 and Em7/D creates a lush, Lydian-inflected IV-major environment, paying homage to Strayhorn’s signature use of upper-structure tensions.
  • The progression utilizes rapid tonicization via ii-V sequences (F#m7-B7 to Emaj7) and chromatic planing (F7#11 to Cmaj7/E), requiring vertical precision across distant key centers.
  • Tritone substitutions, such as Bb7 leading to A7sus, facilitate smooth bass voice-leading while providing the sophisticated, “darker” harmonic colors associated with the Billy Strayhorn influence.

Improvisation Focus D Lydian and melodic target-toning of extensions (9ths and #11s) to navigate shifting tonal centers.

Difficulty Rating 4/5: The non-functional modulations and constant slash-chord movements demand a high level of harmonic awareness and lyrical sensitivity from the soloist.


📚 Standard Available in:

The Real Book - Volume III
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