Upload a song. You get the piano part back as a MIDI file. It works on normal recordings, not only solo piano.
Click one to hear it. Nothing here was cleaned up by hand.
Public domain pieces from the MAESTRO dataset. The audio is our MIDI played on a sampled grand, not the original recording.
Most converters read the whole mix at once, which is why cymbals and bass end up as piano notes. This one separates the song into six instruments first and only reads the piano.