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 Raul Melo of NYC Opera singing E Lucevan le Stelle, "Lullaby" by The Tenors (formerly The Canadian Tenors) at the Cutting Room on Jan 15 2013