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 [geartest] Bass Chorus shootout: Boss CE-5, CEB-3 and CE-2b, [geartest] Boss SY 300 vs Korg G5 and Akai Deep Impact, [geartest] Boss SY300 sounds