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 Gabriel Fauré: Élégie pour violoncelle et piano, Alfred Schnittke: Violin Concerto nº 3/1, Alfred Schnittke, Violin sonata 1 (1st mov.)