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 Polka Family - Fiddle Faddle Polka - Polka Holiday - 1990, Scrubby in White tie and tails - Seven Springs 1986, Polka Town Sound - 100 Proof - Fall Polka Fireworks 1987