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 Mary's Lullaby by John Rutter (arr, David Willcocks), Julian Lloyd Webber plays Shepherd's Lullaby by Thomas J. Hewitt, Clair de Lune by Debussy