Chord Distribution Analysis

Chord SymbolCountFrequency
Gm71114.7%
C71114.7%
F7sus912.0%
Bb912.0%
Bbmaj779.3%
Bb779.3%
Ebmaj979.3%
D979.3%

Key Patterns Detected

PatternFunctionFrequency
Gm7 -> C7Setup (Major Key)11
Bb7 -> Ebmaj9Resolution (Major)7
F7/C -> Bbmaj7Resolution (Major)1

Harmonic Highlights:

  • The progression utilizes secondary dominants like Bb7 ($V^7/IV$) and D9 ($V^7/vi$) to create smooth chromatic transitions into the IV and vi chords.
  • The Imaj7 - I7 - IVmaj9 sequence employs a gospel-inflected subdominant pull, shifting the tonal center briefly away from the tonic.
  • The use of C7 (II7) acts as a secondary dominant of the dominant ($V/V$), which, paired with the F7sus, creates a sophisticated jazz-pop turnaround.

Improvisation Focus: Guide Tone Mapping: Target the “character notes” that define the secondary dominants, specifically the Ab (in Bb7), F# (in D9), and E natural (in C7).

Difficulty Rating: 2/5: The relaxed tempo and repetitive structure are beginner-friendly, though the non-diatonic secondary dominants require intentional note choices beyond the Bb major scale.


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The Real Book - Volume III
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