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 "Mourn, Day is with Darkness Fled" Ian Howell - Countertenor; Karl Wohlwend - Guitar, #12 Quando corpus & Amen- Pergolesi Stabat Mater - Van Doren, Howell, Seattle Baroque Orchestra