Progression sandbox
Tap Roman numerals into the timeline, then press play to hear them. Watch the nudges — every chord has a job, and some chords badly want to move to a particular next chord.
Timeline — tap a chord to add, tap a filled slot to change it, × to remove
Chords in this key
T tonic / homeS subdominant / departureD dominant / tension
Save & recall (kept on this device)
What’s happening
Empty timeline. Add a few chords — try I, then vi, then IV, then V.
Hear it as a real style
Take these chords into the full backing band.
See the key
Where these chords sit on the circle of fifths.