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 Theremin and E. Guitar--Stravinsky Firebird Berceuse (Polygraph Lounge), Kurt Weill's LOST IN THE STARS on theremin in memory of Mary Cleere Haran