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 Eduard Nápravník - Sonata for violin and piano, Cesar Cui - Sonata for violin and piano, Anatoly Sergeyevich Komarowski - Violin Concerto No. 1, 1st movement