Chord Distribution Analysis

Chord SymbolCountFrequency
Bbm737.1%
Dbmaj737.1%
Bbm7b924.8%
Eb13b924.8%
Ab0724.8%
Abmaj724.8%
Eb1324.8%
Ebm724.8%

Key Patterns Detected

PatternFunctionFrequency
F#m7 -> B7Setup (Major Key)1
B7 -> Emaj7Resolution (Major)1
Bbm7/Eb -> Eb7Setup (Major Key)1
Eb7 -> Bbm7b9Resolution (Minor)1
Ebm7 -> Ab7b9Setup (Major Key)1
Ab7b9 -> Dbmaj7Resolution (Major)1
Bbm7 -> Eb7susSetup (Major Key)1

Harmonic Highlights

  • Employs a signature Strayhorn “drag” by preceding the tonic with a diminished chord (Ab°7), creating a heavy, somber resolution from the altered V7.
  • Features sophisticated subdominant movement using a tritone substitution (D9#11) to target the IV chord (Dbmaj7).
  • Utilizes a sudden, remote modulation to E major (bVI) via an F#m7 - B7 sequence, showcasing Strayhorn’s penchant for non-diatonic tonal shifts.
  • Integrates dense chromatic voice leading through the use of Abm6 and passing diminished chords, blurring the line between major and minor tonalities.

Improvisation Focus Chromatic Voice Leading and Modal Interchange: Prioritize navigating altered tensions (b9, #11) and connecting the distant Ab major and E major tonal centers through smooth scalar transitions.

Difficulty Rating 4/5: The slow tempo demands mastery over dense, altered harmonies and the ability to navigate frequent modulations to unrelated keys with melodic continuity.