Chord Distribution Analysis

Chord SymbolCountFrequency
Am7414.3%
C7414.3%
D7310.7%
Bbm7310.7%
Gm727.1%
Fmaj713.6%
B713.6%
Bbmaj713.6%

Key Patterns Detected

PatternFunctionFrequency
Am7 -> D7Setup (Major Key)2
Bbmaj7 -> Eb7Setup (Major Key)1
D7 -> Gm7Resolution (Minor)1
C7 -> Fm7Resolution (Minor)1
D7 -> Am7b5Resolution (Minor)1
Gm7 -> C7Setup (Major Key)1

Harmonic Highlights

  • Utilizes tritone substitutions such as B7 (subV7/IV) and Eb7 to create chromatic, non-diatonic transitions into the IV and I chords.
  • Employs modal interchange between F major and F minor (e.g., Fm7 to Bbm7), adding a “blues-noir” harmonic texture characteristic of Hefti’s style.
  • Features secondary dominant chains and II-V-I cycles (Am7–D7 to Gm7–C7) that provide melodic momentum while reinforcing the F major tonality.

Improvisation Focus The F Blues scale integrated with chord-tone targeting to navigate the frequent chromatic substitutions and shifting II-V-I cells.

Difficulty Rating 3/5: While the relaxed tempo is approachable, the constant chromatic modulations and non-diatonic dominant chords require advanced harmonic awareness and precise note selection.


📚 Standard Available in:

The Real Book - Volume II
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