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 Bach - C Minor Prelude (WTC, bk. 1) - Harmonic Analysis, Tchaikowsky: Waltz of the Flowers Harmonic Analysis, Harmonic & Melodic Sequences