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: "Herr Jesu Christ, dich zu uns wend" BWV 655, J.S. Bach, Triosonate No.1 Es-Dur BWV 525 (3)