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 Arensky - Chant Triste, Walton cello concerto - Jamie Walton, Saint Saëns - Sonata Op.32 No.1: III. Allegro Moderato