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 Sibelius -- King Christian II Suite (Stockholm Radio Orchestra/Stig Westerberg), Leopold Godowsky plays Chopin Sonata no. 2 opus 35 (3/3), Chopin's Etude opus 25 no. 2 in F minor: A Historical Comparison