videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including Erik Satie Gymnopedie no 2, sheet music here http://bit.ly/1457XIU, bach prelude from 1st cello suite, guitar, get the sheet music http://bit.ly/10KGsiP, canarios-gaspar sanz sheet music here http://bit.ly/15xl2WK