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 Chopin - Funeral March on Organ, Gershwin - Rhapsody in Blue - on piano - Part 1/3, Smyth/Crockett: Oh, How Lovely Was the Morning