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 Ave Maria (Бах - Гуно) Играет Ольга Миланич (терменвокс), Concerto for Theremin by Anis Fuleihan - 1945 \ Clara Rockmore (Theremin)