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 2011-08-21 Cornerstone Apostolic Youth Choir singing Ive Got A River Of Living Water, Timberland High School A Capella Choir December 2009 singing Hallelujah Chorus from Messiah