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 Marimba - Toccata - Prestissimo (original composition), Violin Sonata - mov. 1 (original composition), Violin Sonata mov. 2 - Presto (original composition)