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 Marie-Pier Jean 10 year old sings Sound of Music's Lonely Goatherd song, Marie-Pier Jean age 13 sings A Highland Lullaby - Practice for Kiwanis 2012