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 François Couperin: Les Bergeries / Naïvement - Markus Märkl, Harpsichord, Georg Muffat: Toccata Septima - Markus Märkl, Organ