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 Orthodox choir music - Krzysztof Penderecki: Kheruvimskaya pesn/Song of the Cherubim, Antonin Dvorak: Čert a Káča/ The devil and Kate - Overture, Sacred music of 20th Century-Miro Bazlik: Canticum 43 for soprano, choir and orchestra