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 J.S. Bach's Prelude and Fugue in C Minor, Canticle for Timpani by Stanley Leonard - Andrew Keller, Gavotte En Rondeau: Bach Violin Partita No. 3 - Andrew Keller