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 Yamaha MX49 - My Sound Examples - I love this Synthesizer, Cescato Musiktechnologie - Trans Computer Maschine - Plugin - Free - SoundExamples, 100 E-lec-tro Sounds by CHE for the Image Line Harmor