Four bars of whatever you want

A piano roll on top, drums underneath — each column is an eighth note, heavier lines mark the bars. Click or drag to paint notes, stack them for chords, press play, and it loops. Turn on a scale shade if you want guide rails: tinted rows always sound good together.

Stuck? Load the demo, listen once, then change one thing at a time — move a note, add a kick, bend the swing. Composition is mostly editing. Click a note name on the left edge to preview that pitch.