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 J.S. Bach / Weichet nur, betrübte Schatten, BWV 202 (Rifkin), Henry Cowell / Quartet for Flute, Oboe, Cello, and Harpsichord, Rameau / Suite for Keyboard in E minor (Kirkpatrick)