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 Bach BWV 208-5 "Schafe können sicher weiden" ("Sheep may safely graze"), Greek Chant - Joyful Light (Phos Hilarion), Vedel - "Thee do I magnify"