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 [SMA/SM5] Pump It Up 2015: Prime (v1.00) - New Tunes, [StepMania AMX] Fiesta's Music Train - B.P.M. Collections