Guide
MP3 to sheet music: turning a recording into a score
Transcribing a song by ear is a classic musician skill, and also hours of work. Software can now do a large part of it from an MP3. Here's how it works, where it fails, and how to get a score you can actually rehearse from.
How audio-to-score conversion works
A modern pipeline has four steps:
- Source separation. A neural network splits the recording into stems: vocals, drums, bass, guitar, piano and "other". This matters more than anything else; transcribing a full mix mixes up every instrument.
- Beat and tempo tracking. The software finds the tempo, where bar 1 starts, and the meter (4/4, 3/4, 6/8). With a steady tempo, every bar is the same length.
- Note transcription. Each stem goes through a model trained for that instrument: a melody model for the voice, a polyphonic model for piano and guitar, a drum model that recognizes kick, snare and hi-hat.
- Quantizing and notation. Notes are snapped to the beat grid (eighths, sixteenths, triplets or swing) and written out with key signature, chord symbols and readable rhythms.
What it gets right
- Tempo, key and structure (verse, chorus, bridge) on most pop recordings.
- Bass lines: one note at a time, clear pitch, usually very accurate.
- Drum grooves: kick, snare and hi-hat patterns.
- The vocal melody, when the voice is clean and up front.
What it gets wrong
- Dense piano and guitar voicings: it may miss inner notes or add octave doublings.
- Expressive timing: rubato, pushed and laid-back phrases get quantized to the nearest grid line.
- Ornaments and slides: written as extra short notes.
- Reverb-heavy and live recordings: the separation leaks, and ghost notes appear.
Tips for a better result
- Use the best source you have: a WAV or high-bitrate MP3 beats a phone recording of a concert.
- Pick a section, not the whole song, if you only need the chorus.
- Clean up before you edit: remove notes that are too short, fix octave jumps, force notes into the key.
- Check by ear against the stem: solo the bass stem while reading the bass part. Errors jump out.
- Simplify on purpose. A readable part that sounds right beats an exact copy that nobody can sight-read.
Export formats you'll want
- MusicXML: open and edit in MuseScore, Sibelius, Dorico, Finale.
- MIDI: drop into Logic, Ableton, Cubase or GarageBand.
- PDF: print the score and parts.
From one song to a whole medley
Medley Writer runs exactly this pipeline (separation, beat grid, per-instrument transcription and clean-up) for each song you upload, then joins the sections you pick into one continuous score for your line-up, with an editor to fix anything the transcription missed.
Let Medley Writer do the transcribing
Upload the songs, choose the parts and the order, and get a full arrangement for your band with the transitions written in. Free during the beta.
Join the waitlist