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 Waubonsie Valley HS "Sound Check" at Wheaton Warrenville South "Choral Classic" 2013 preliminaries, Bare Naked Statues -Defending ICCA Midwest Champions 2015 set