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 K. Szymanowski: Etudes op. 33 (Rudy) - 1/2, S. Rachmaninov : Prelude op. 23 no. 5 in G minor (Berezovsky), Franz Liszt : Concert study in D flat major "Un sospiro"