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 FM8Synth - Intermediate - Saw Bass Stab using FM8 Synthesizer, FM8Synth - Basic Series - Pad, FM8Synth - Intermediate - Simple Riser using FM8 Synthesizer