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 Dietrich Buxtehude: Mit Fried und Freud ich fahr dahin, A. Vivaldi / J.S. Bach: Concerto D-Dur BWV 972, Sebastian Kuechler-Blessing: Improvisation Part 1