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 : Petit prélude en do mineur, BWV 999, Louis Couperin: Prélude non-mesuré (ed. Heugel, p. 120), Giles Farnaby : His Rest