Chord Distribution Analysis

Chord SymbolCountFrequency
F6422.2%
Eb6422.2%
Bbmaj7211.1%
F7sus15.6%
F715.6%
Bbm715.6%
Eb715.6%
Abm715.6%

Key Patterns Detected

PatternFunctionFrequency
F7 -> Bbmaj7Resolution (Major)1
Bbm7 -> Eb7Setup (Major Key)1
Eb7 -> Abm7Resolution (Minor)1
Abm7 -> Db7Setup (Major Key)1
Db7 -> Gbmaj7Resolution (Major)1

Harmonic Highlights

  • The initial F6 to Eb6 oscillation establishes a Mixolydian modal framework, utilizing the bVII major chord to create a relaxed, non-functional tension.
  • The progression employs sequential ii-V patterns (Bbm7–Eb7 moving to Abm7–Db7) that descend by whole steps, creating a sense of rapid tonal shifting before resolving to Gbmaj7.
  • Modal interchange is highlighted by the direct juxtaposition of Bbmaj7 and its parallel minor, Bbm7, which pivots the harmony from a bright I major to a darker subdominant minor feel.
  • The movement from Gbmaj7 to C7 functions as a bII to V substitute or a chromatic approach, bridging the distant flat-key bridge back to the primary F tonality.

Improvisation Focus The F Mixolydian scale and the navigation of chromatic ii-V sequences in the bridge.

Difficulty Rating 3/5: While the modal vamps are straightforward, the bridge’s rapid modulations and parallel minor shifts require intermediate harmonic fluency.


📚 Standard Available in:

The Real Book - Volume II
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