MP3 to Sheet Music: Convert the Audio to MIDI First
Short answer
Yes. But not in one step, and not on this page.
This page turns MP3 into MIDI. It does not draw a staff. The second half is free: MuseScore can import MIDI files and convert them into music notation, and its official handbook says exactly that.
Why go through the middle file? Because every guess happens in the first half. Keep the MIDI and you can fix a wrong note in an editor.
A finished score has no such give. One wrong note in it means running the whole thing again.
In this build's own test on a C major scale with the ground truth known, 7 to 8 of every 8 notes come back at the correct pitch. What we cannot tell you is how your recording will do, because that depends on the take.
A full song is the hardest input this tool gets. Start with thirty seconds of one instrument instead.
Try it on thirty seconds of one instrument Runs in your browser, no upload, no sign-up.
MP3 to sheet music is two different jobs
The first job is guessing which notes were played. The second is drawing them.
Only the first one is hard. Drawing a note you already know is a solved problem.
Guess wrong and no amount of engraving saves you.
Everything that disappoints people about MP3 to sheet music happens in the first job. A score is only the notes written down, so when the notes are wrong the score is wrong in exactly the same places.
What this page does, and what it does not
This page reads one pitch at a time and writes a standard MIDI file. SMF format 1, one track, 480 tpqn, with a tempo event carrying the BPM you set.
It does not draw a staff, a clef, or a barline. If you want something you can print, the MIDI goes into a notation program.
That is the boundary of this page, and it is worth saying out loud.
Nothing is uploaded. Your browser decodes the file, the pitch tracker runs on your own device, and the MIDI is built in memory. There is no account and no e-mail.
What the MIDI file does not carry
The file carries note pitches, start times, lengths, a velocity taken from loudness, a track name, and a tempo event. That is the whole list.
It writes no key signature and no time signature, so the notation program has to guess both. This is not a bug in the file. It is what this converter writes.
MIDI also cannot say whether a note is C sharp or D flat. It stores a note number, not a spelling. Barlines, dynamics, slurs, fingering and lyrics are all things a notation program adds, or that you add by hand.
The part that decides whether the score is readable
Three things break the first half. All three are fixed before you convert, not after.
A backing track. Melody mode follows one pitch at a time, so in a full mix it follows whatever is loudest. In this build's own test on a melody over bass and percussion, every recovered note came from the bass part.
Reverb. In this build's test it split one sustained note into two.
Noise. In the noisy version of the same test every correct note was still there and in the right order, but extra low notes appeared in the gaps between them.
Why the grid is not the problem
People blame the timing grid. It is not the grid.
The file is written at 480 tpqn, so one beat is split into 480 steps. Note times are rounded to the nearest tick as the file is written, and at 120 BPM half a tick is about half a millisecond.
What you can actually hear is bigger than that. Measured on this build, vibrato shifted the first note's onset by a few hundred milliseconds, which is hundreds of ticks.
Half a millisecond does not need fixing. A few hundred does.
Raising the resolution does nothing for that. Trimming the take does.
Turning the MIDI into a score
MuseScore reads it directly. The official handbook puts it this way: MuseScore can import MIDI files (.mid/.midi/.kar) and convert them into music notation.
Open one and MuseScore applies default quantization. The MIDI Import Panel is where the score becomes readable: quantisation, max. voices, search tuplets, simplify durations, and Split staff, which spreads a piano part over two hands.
Quantization snaps the onsets you got onto the grid you want. It cannot put back a note the tracker never found.
This build has not been measured end to end into a finished score, so treat that last sentence as reasoning from how the two halves work rather than a number.
How to do it, in order
- Cut the take down. One instrument or a stem, twenty to forty seconds.
- Trim the silence at both ends and any reverb tail. Reverb glues one note to the next, and in this build's test it split one sustained note into two.
- Set Note range to the real span of the part. This is the highest-value step on the page.
- Set Analyse to the first 30 seconds and convert once. If the settings hold, run the whole file.
- Open the .mid in MuseScore and set quantisation in the MIDI Import Panel before you judge the result.
- Fix the key signature and the enharmonic spelling by hand. MIDI cannot tell the program which one you meant.
Step two is the one people skip. Guess which one costs the most notes?
FAQ
Can you convert MP3 directly to sheet music?
Not in one step. This page converts MP3 to MIDI, which is the notes without any staff.
Free notation software such as MuseScore imports that MIDI and draws the score. The two halves fail in different ways, which is why splitting them is worth doing.
Is a MIDI file the same thing as sheet music?
No. MIDI holds note events: pitch, start time, length, and a velocity taken from loudness.
Sheet music is a drawing of those notes with a key signature, a time signature, barlines and spelling added on top. You need the second thing to read the first one comfortably.
What program turns the MIDI into a score?
MuseScore is the free answer. Per its official handbook, MuseScore can import MIDI files (.mid/.midi/.kar) and convert them into music notation.
Any editor that opens standard MIDI will do the same job. Use the MIDI Import Panel to set quantisation before you judge the result.
Why does my score have the wrong key signature?
Because the MIDI never said what the key was. This converter writes a track name, a tempo event and the notes, and no key signature, so the notation program guesses.
Change it by hand once the score is open. The same goes for the time signature.
Why is the rhythm wrong after I import the MIDI?
Two causes, and they need different fixes. Quantization snaps note starts to a grid, so a grid that does not match your music makes the rhythm wrong even when every note is right.
If the notes themselves land late, the cause is earlier: measured on this build, vibrato shifted the first onset by a few hundred milliseconds.
Can it transcribe a whole song with chords and bass?
Not reliably. Melody mode reads one pitch at a time, so a full mix is read as whichever part is loudest. In this build's test on a melody over bass and percussion, every recovered note came from the bass.
Use a stem, or transcribe one line at a time and stack the results.
Can it make a piano score with both hands?
Only one line at a time. This converter is a melody tracker, so it will not separate a left hand from a right hand for you.
MuseScore has a Split staff option in its MIDI Import Panel for piano parts, but you have to feed it one line at a time.
Is my recording uploaded anywhere?
No. Your browser decodes the file and runs the pitch tracker on your own device, and the MIDI is built in memory. There is no account, no upload and no e-mail.
You can check it yourself: open the network panel, convert something, and watch. Nothing moves.
Judge the first half on your own recording. Thirty seconds of one instrument, no backing, no reverb tail. That tells you more than any page can, including this one.