There are multiple parts to this problem, but it seems quite doable. Shazam can do generic look-up of music since around 2003, see for example this page on abr

There are multiple parts to this problem, but it seems quite doable. Shazam can do generic look-up of music since around 2003, see for example this page on abracadabra [1]. I'd guess that if you limit things to a piano, one could relatively easily find the notes being played with some Fourier magic, and then solve a Hidden Markov Model to find the most plausible position in the music. Using a MIDI interface makes it even simpler. [1] https://www.cameronmacleod.com/blog/how-does-shazam-work https://www.cameronmacleod.com/blog/how-does-shazam-work