Chord Distribution Analysis

Chord SymbolCountFrequency
G7616.7%
C6513.9%
Dm7513.9%
Em7411.1%
C#0725.6%
Dm625.6%
D#0725.6%
Am725.6%

Key Patterns Detected

PatternFunctionFrequency
Dm7 -> G7Setup (Major Key)5
Em7 -> A7Setup (Major Key)2
C7 -> Fmaj7Resolution (Major)1
F#m7b5 -> B7b9Setup (Minor Key)1
B7b9 -> Em7Resolution (Minor)1
A7 -> Dm7Resolution (Minor)1

Harmonic Highlights

  • The A section utilizes a classic ascending chromatic bass line (I6 โ€“ #Io7 โ€“ ii6 โ€“ #iio7 โ€“ iii7), where diminished 7th chords function as secondary leading-tone passing chords.
  • Standard diatonic cycling (iii โ€“ vi โ€“ ii โ€“ V) is frequently embellished with secondary dominants (A7 โ€“ D7 โ€“ G7), creating a series of nested ii-V progressions.
  • The use of Ebยฐ7 acts as a passing diminished chord (bIIIยฐ7) between the tonic and the supertonic, facilitating smooth linear voice leading.

Improvisation Focus C Major Bebop scale combined with diminished arpeggios to outline the chromatic passing movement.

Difficulty Rating 2/5: While the harmonic rhythm is fast, the tune remains strictly in the C major tonal center without complex modulations.


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The Real Book - Volume I
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