Chord Distribution Analysis
| Chord Symbol | Count | Frequency |
|---|---|---|
| Bb7 | 10 | 28.6% |
| Db7 | 8 | 22.9% |
| Ab6 | 5 | 14.3% |
| Bbm7 | 3 | 8.6% |
| Eb7 | 2 | 5.7% |
| C7 | 1 | 2.9% |
| Fm7 | 1 | 2.9% |
| D7 | 1 | 2.9% |
Key Patterns Detected
| Pattern | Function | Frequency |
|---|---|---|
| Bbm7 -> Eb7 | Setup (Major Key) | 2 |
| C7 -> Fm7 | Resolution (Minor) | 1 |
| Fm7 -> Bb7 | Setup (Major Key) | 1 |
| F7 -> Bbm7 | Resolution (Minor) | 1 |
Harmonic Highlights
- The progression utilizes extended non-diatonic dominant 7th chords (Db7 and Bb7), functioning as the IV7 and II7 degrees, which creates a bright, “hot jazz” harmonic palette.
- A secondary dominant movement (C7 to Fm7) briefly tonicizes the relative minor, offering a functional departure from the surrounding dominant-cycle framework.
- The D7 chord serves as a chromatic tritone substitute, providing a smooth voice-leading bridge back to the Db7 during the turnaround.
Improvisation Focus The Lydian Dominant scale (specifically Db Lydian Dominant) to effectively manage the #11 tension over the prominent IV7 chord.
Difficulty Rating 3/5. The high performance tempo and frequent shifts between distinct dominant tonalities require significant mental agility and scale fluency.