Chord Distribution Analysis

Chord SymbolCountFrequency
Bbm614.3%
Fm49.5%
F749.5%
C7b5#924.8%
F7b5#924.8%
Dbmaj724.8%
Dm724.8%
G724.8%

Key Patterns Detected

PatternFunctionFrequency
Fm -> C7b5#9Setup (Major Key)2
C7b5#9 -> FmResolution (Minor)2
F7 -> BbmResolution (Minor)2
Bbm -> F7b5#9Setup (Major Key)2
F7b5#9 -> BbmResolution (Minor)2
Dm7 -> G7Setup (Major Key)2
Bbm7 -> Eb7Setup (Major Key)2
Eb7 -> Abmaj7Resolution (Major)2
Gm7b5 -> C7b9Setup (Minor Key)2
G7 -> Cmaj7Resolution (Major)1
C#m7 -> F#7Setup (Major Key)1
F#7 -> Bmaj7Resolution (Major)1
Cm7 -> F7Setup (Major Key)1
F7 -> Bbmaj7Resolution (Major)1
C7b9 -> FmResolution (Minor)1
G7 -> Cm7b5Resolution (Minor)1
Cm7b5 -> F7Setup (Minor Key)1
F7 -> Bbm7Resolution (Minor)1

Harmonic Highlights

  • Frequent use of altered dominants ($C7\flat5\sharp9$ and $F7\flat5\sharp9$) to create high-tension resolutions into the minor tonic and subdominant.
  • Sequential ii-V-I modulations descending by minor thirds ($Cmaj7$, $Bmaj7$, $Bbmaj7$), requiring rapid adaptation to distant tonal centers.
  • Strategic use of $F7$ as a secondary dominant pivot to transition from the $F$ minor tonic to the $B\flat$ minor subdominant area.

Improvisation Focus Navigating rapid, non-diatonic ii-V-I sequences at high tempos.

Difficulty Rating 5/5: The combination of extreme “up” tempos and constant modulation through distal key centers requires advanced harmonic fluency and technical facility.


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The Real Book - Volume I
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