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 Kabalevsky: Violin Concerto in C Major, Op. 48, I - Allegro molto e con brio, J.F. Mazas: Violin Etude Op. 36, Nr. 3