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 J. Brahms Trio in E-flat Major Op. 40 for Violin, Viola and Piano, II. Scherzo, Shostakovich "Three Violin Duets", Vitali Chaconne in G minor for violin and piano