Audio to sheet music. Turn a sung or played melody into notation, free, in your browser, no sign-up.

Writing down a tune you can sing but can't notate. Hum or sing it into your phone, drop the recording here and you have a lead sheet to tidy, print or hand to a player. A melody you picked out on guitar or piano works the same way, one line at a time.

Learning a melody from a recording: isolate the vocal or the solo first (the free vocal remover, or AI stem separation in the studio) and convert just that line, then check the notes against the recording.

The audio is transcribed by Basic Pitch, Spotify's open-source neural pitch model, running in your browser through WebAssembly. It finds every pitched note with a start and an end. Sheet music for one staff needs one line, so wherever notes overlap, the highest is kept: right for a melody, wrong for chords, which come out as their top note.

The tempo is measured from the recording, and each note is rounded to the nearest sixteenth at that tempo, written in 4/4 with ties across bar lines. The key signature is estimated from the notes themselves, and accidentals are spelled to suit it. A freely sung, rubato performance won't sit on a grid, so expect to tidy the rhythm; the MusicXML opens in any notation program for exactly that.

Record dry and close, in a quiet room: reverb smears the end of one note into the next. Sing or play steadily and in time, ideally to a click. One voice or instrument only: a backing track, a strummed chord or a second singer adds notes that aren't the melody.

If the tempo reads at half or double speed, the notes are still right but the note values are halved or doubled; open the MusicXML in a notation program and change the time values, or record against a metronome.