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 Franz Clement : Violin Concerto No. 2 in D minor, Erich Wolff: Violin Concerto in E-flat Major, Op. 20, Julius Klengel: Cello Concerto No. 4 in B minor, Op. 37