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 Saint-Saens - Danse macabre for Violin and Piano, Op.40, Poulenc - Trio for Oboe, Cello and Piano (1928), Alexander Kobrin: Schubert - Piano Sonata No.16 in A minor, Op.143/D.784 (movement 1)