Hansy / Guides / Convert MP3 to MIDI

How to convert MP3 or WAV to MIDI, with every instrument on its own track

Most converters squash a whole song into one MIDI track. Here's how to get one track per instrument instead (piano, bass, guitar, the vocal melody, drums), so each part is usable on its own.

1. Add the song

Open RosenBridge and add the MP3, WAV, FLAC or other audio file, up to 10 minutes long, or any length once you have credits. It goes on a track of its own and stays there as your reference.

2. Convert every part

Press Convert. Hansy listens for each instrument and writes its notes as a MIDI track of its own, usually in about a minute of GPU time. GPU steps need a free account; you choose which parts to keep before they're added.

• Busy mix? Separate the song into stems first, then convert each stem and tell Hansy what it is (piano, bass, guitar chords…). Notes come out cleaner.
• Just the melody? Convert the vocal stem. The sung melody becomes a MIDI track, and Vocals can add the words under its notes.

3. Check and fix the notes

Play the MIDI against the original: mute and solo tracks to compare. Open a part in the MIDI editor to delete stray notes, fix wrong ones, quantize the timing or move it to another key.

4. Download the MIDI

The last step downloads every part in one .mid, or a file per part (each track's ⋮ menu has one too). It's a standard MIDI file, so any DAW, notation app or keyboard can open it.

Can you convert MP3 to MIDI for free?

You can open RosenBridge, add songs, edit MIDI and download it without paying. Converting runs on a GPU and uses GPU minutes, which need a free account.

Does it work with WAV files?

Yes. WAV, MP3, FLAC, OGG and other common audio files all work the same way.

Will it get every note right?

No converter does on a full mix. Clear parts come out close; dense or distorted ones less so. Separating first and fixing notes in the editor gets you the rest of the way.

Can it turn vocals into MIDI?

Yes. The vocal melody becomes a MIDI track like any other part, and the Vocals tools can put the sung words under its notes.

Common problems

• Lots of tiny stray notes. They're usually bleed from other instruments. Untick small parts when converting, or delete them in the editor.
• A part is in the wrong octave. Select its notes and press +12 or −12 in the MIDI editor.
• The timing drifts from the grid. Use Detect key & tempo so the bars follow the song, then quantize.