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 - Presto from Sonata in G minor for solo violin, BWV1001, Daniel Migdal - Mozart: Violin Concerto No. 1 - III. Presto, Andreas Brantelid and the Norwegian Radio Orchestra / Andrew Manze plays Haydn