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 Luboš Fišer - The Hands, sonata for violin and piano, Pavel Haas - Wind quintet, Op. 10, Josef Bohuslav Foerster - Violin Concerto No. 1 c minor, Op. 88