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 Josh Eidsor - 2011 Allenton Concertina Jamboree, Kujawiak #6 - Pan Franek, Zosia & Polka Towners - 2014 Pulaski Polka Days, Fire House Polka - Dr. Ray Adamczyk - 2011 Hartford Concertina Jamboree