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 Sevastian 2010: Finale to "Don River Rhapsody", Semyonov, Bayan Orchestra of Moscow's Gnessin Music Institute plays Liszt, Frank Marocco: Fugue for Art, 1995