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 Jimmy Homel's Changing Times (2011) - Stas and Mania Polka.mpg, Wanda & Stephanie (1988) - Seven Days & Seven Nights Polka, Freeze Dried (2013) - Lucky Polka