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 Super Smash Bros. 4 - Light Plane (Vocal Mix) (Synthesia Piano Tutorial), Super Smash Bros. 4 - Magicant/Eight Melodies (Synthesia Piano Tutorial), MapleStory - Memories of a Decade (10th Anniversary Medley)