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 December 2 2009 - A Theremin Tribute to Ramses Shaffy (2 songs "Laat me" & "We Zullen Doorgaan") (l), December 22 2009 - 2 Dutch Christmas Carols on a Theremin (with chorus parts) ;-), September 10 2009 - The Lion Sleeps Tonight on a Theremin (with theremin chorus background !) ;-)