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 Pulaski Polka Days 2009, 05 Music Connection El Rio Drive Polka, Full Circle Top of the World Polka Pulaski Polka Days 2009