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 Absolute Harmony Acapella Choir singing 'Set the Fire to the Third Bar', Absolute Harmony A Cappella singing Somewhere over the Rainbow-Im Yours, S.I.N.G singing California Dreaming Acapella 2010