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 "Panis Angelicus" - Franck - Duets by Jesse and Jack, "Canon in D" - Pachelbel - Duets by Jesse and Jack, "Palladio" - Jenkins - Duets by Jesse and Jack