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 TURANDOT - Calaf "Nessun dorma!" (with subtitles), Minnesota Opera, The Magic Flute, Twin Cities, Ordway Music Theater, November 14-22, Minnesota Opera's Orpheus and Eurydice - The Myth in Music