Circle of 4ths II-V-I
All 12 Keys Practice
Meter: 4/4
Total Bars: 48
Display Options
Key Center Legend
(Jazz Routine)
Circle of 4ths II-V-I
All 12 Keys Practice
Key: C Major
Interactive Lead Sheet • Multi-Key Visualization
Real Book Syntax Compatible
Progression Data Editor
Format: Array of objects with measure, chords (array of strings), section (optional: "A", "B"), and key (e.g. "C Major", "F Major", "Bb Major", etc.).