Free GarageBand MIDI generator — roll complete MIDI arrangements (melody, chords, bass, drums) in your browser and drag them into GarageBand. No sign-up.

The generator lives in the studio — roll full arrangements, edit every note, export MIDI, WAV or MP3.
MIDI Maker is a free online MIDI generator that produces complete arrangements — melody, chords, bassline, and drums — as standard MIDI files GarageBand opens with a single drag. It's an easy way to start a GarageBand project with real musical material instead of an empty grid.
On a Mac you can also stream the generator into GarageBand in real time: enable the IAC Driver, switch on Live MIDI Out in the studio (Chrome/Edge), and record onto any armed track — the same routing as the Logic setup described in the MIDI Out docs and the live MIDI sequencer guide. See the Live MIDI Out docs and the guide to using MIDI Maker as a live MIDI sequencer for the full walkthrough.
Yes — GarageBand turns each part of the .mid into a software instrument track, so you can assign any Library sound: keys or synths for the pitched parts and a drum kit for the drum track, which uses the standard General MIDI drum mapping.
Yes — on a Mac, enable the IAC Driver in Audio MIDI Setup and turn on Live MIDI Out in the studio (Chrome or Edge). GarageBand listens to all MIDI inputs automatically, so a record-armed software instrument track captures the generator as it plays.
Yes — everything the generator writes is royalty-free with no attribution required. Free and Pro output is licensed for personal projects, and the Studio plan adds a commercial-use licence for releases, games, videos and client work.
The MIDI Maker studio rolls complete, editable arrangements — melody, chords, bass and drums — you can export to any DAW. Free, in your browser.
Open the Studio — Free