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 Maksym Berezovs'kyi - Sonata for violin and harpsichord (1772), Valeriy Kikta - "Frescoes of St. Sophia of Kyiv" (1974) - part 1