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 Eastern Orthodox Oil Lamp and Icon Corner: Troparion to St. John Chrysostom; Greek Chant, O come let us Worship: Georgian Chant; Vaalam Monastery in Russia. (English), Trisagion: Orthodox Chant; Mt Athos, Byzantine style.