Chord Distribution Analysis

Chord SymbolCountFrequency
Fm7814.5%
Cm7712.7%
Ebmaj759.1%
Db759.1%
Gm747.3%
Bb747.3%
Bbm735.5%
Abmaj735.5%

Key Patterns Detected

PatternFunctionFrequency
Fm7 -> Bb7Setup (Major Key)3
Bbm7 -> Eb7Setup (Major Key)2
Eb7 -> Abmaj7Resolution (Major)2
Bb7 -> Ebmaj7Resolution (Major)2
Cm7 -> F7Setup (Major Key)2
Fm7 -> Bb7susSetup (Major Key)2
Ebmaj7 -> Bb7Setup (Major Key)1
Abm7 -> Db7Setup (Major Key)1
Bb7b9 -> Ebmaj7Resolution (Major)1

Harmonic Highlights

  • Uses a diatonic ascent (Imaj7–ii7–iii7) followed by a tritone substitution (Db7) to pivot into the relative minor (Cm7).
  • Employs a secondary ii–V (Bbm7–Eb7) to establish a brief subdominant (Abmaj7) tonal center.
  • Features a “backdoor” bVII7 (Db7#11) resolution to the tonic, providing a sophisticated Lydian b7 color.
  • Incorporates chromatic turnaround chords like B7#9 to bridge the gap between standard ii–V–I movements.

Improvisation Focus Eb Major scale with an emphasis on the Lydian Dominant scale over the frequent bVII7 (Db7) chords.

Difficulty Rating 3/5. The progression maintains a clear tonal center in Eb but requires the soloist to navigate frequent non-diatonic substitutions and secondary dominants.


📚 Standard Available in:

The Real Book - Volume III
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