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 Bach/Casadesus: Concerto for Viola C Minor - Kim / Molęda / DKO, Verdi/Lovreglio: Fantasy on Themes from La Traviata - Kim / Molęda / DKO