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 - 2014 - Mother-In-Law Polka - Frankenmuth Summer Music Fest, Pan Franek - 2013 - Polka Hoedown - Frankenmuth "Summer Music Fest", Pan Franek - 2014 - Mountaineers Polka - Frankenmuth Summer Music Fest