Chord Distribution Analysis
| Chord Symbol | Count | Frequency |
|---|---|---|
| Eb7 | 9 | 21.4% |
| Bbm7 | 5 | 11.9% |
| Abmaj7 | 5 | 11.9% |
| Bbm7b5 | 5 | 11.9% |
| D7sus | 2 | 4.8% |
| D7 | 2 | 4.8% |
| Bb7 | 2 | 4.8% |
| Dbmaj7 | 2 | 4.8% |
Key Patterns Detected
| Pattern | Function | Frequency |
|---|---|---|
| Bbm7 -> Eb7 | Setup (Major Key) | 5 |
| Eb7 -> Abmaj7 | Resolution (Major) | 4 |
| Bbm7b5 -> Eb7 | Setup (Minor Key) | 3 |
| Eb7 -> Bbm7b5 | Resolution (Minor) | 2 |
| Bm7 -> E7 | Setup (Major Key) | 1 |
| Ab7 -> Dbmaj7 | Resolution (Major) | 1 |
Harmonic Highlights:
- Non-diatonic iiø7-V7 progressions (Bbm7b5-Eb7) resolve to the major I (Abmaj7), introducing a minor key flavor within a major context.
- Abrupt half-step modulation to the ii-V of A major (Bm7-E7) creates significant harmonic tension and unexpected shifts.
- Clear tonicization of the IV chord (Dbmaj7) via its V7sus-V7 (Ab7sus-Ab7) provides a strong subdominant resolution.
- The opening D7sus-D7 functions as a highly chromatic dominant, likely a tritone substitute for Ab7, setting an “outside” harmonic tone.
Improvisation Focus: Adapting quickly to transient modulations and chromatic substitutions.
Difficulty Rating: 5 (Advanced). The frequent and abrupt modulations to distantly related keys, combined with altered dominants, demand sophisticated harmonic understanding and rapid adaptation.