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 Brahms: Trio in E-flat Op. 40 for Violin, Horn, and Piano, Steve Reich: Electric Counterpoint (I. Fast), Mozart: Violin Concerto No. 3. K 216