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 Mother-32 | Semi-Modular Analog Synthesizer, A Brief History of the Theremin | Albert Glinsky, Etherwave Plus Theremin + Little Phatty vs MOOG NINJA