Chord Distribution Analysis

Chord SymbolCountFrequency
C71125.6%
Bb6920.9%
F7#549.3%
Gm749.3%
Cm737.0%
C7#524.7%
D724.7%
F724.7%

Key Patterns Detected

PatternFunctionFrequency
Gm7 -> C7Setup (Major Key)3
C7 -> Gm7Resolution (Minor)2
D7 -> Gm7Resolution (Minor)1
Am7b5 -> D7b13Setup (Minor Key)1
Cm7 -> F7b9Setup (Major Key)1
Cm7 -> F7Setup (Major Key)1

Harmonic Highlights

  • The progression centers on a relative major/minor relationship, pivoting between Bb6 (I) and Gm7 (vi/i) using D7 as a secondary dominant (V/vi).
  • Augmented dominants (F7#5, C7#5) provide chromatic voice leading, moving the #5 interval smoothly into the 3rd or 6th of the resolving chord.
  • The Ebm6 functions as a minor plagal cadence (iv6), a quintessential “sentimental” device that creates a dark-to-light resolution back to the Bb major tonic.
  • Sequential secondary dominants, such as C7 (V/V) moving toward F7, establish a cycle-of-fourths motion that reinforces the tonal center.

Improvisation Focus Chord Tone Soloing: Target the 3rds and 7ths to navigate the frequent dominant-to-tonic resolutions and chromatic alterations.

Difficulty Rating 2/5: The harmonic rhythm is predictable and the changes stay within a narrow tonal axis, making it highly accessible for developing improvisers.


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The Real Book - Volume III
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