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 "Orkney Lullaby" by Schutz-2005 NMMEA All State Womens Choir, "Music Down to My Soul" by Moses Hogan-2006 NMMEA All-State Mixed Chorus