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 Sibelius: Concerto in D minor Op. 47 - I. Allegro moderato Svetlin Roussev, violin, Franck: Andantino quietoso Op. 6, Svetlin Roussev, Haruko Ueda