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 Beethoven - "Kreutzer" Sonata, 1st mov. / Loo Bang Hean (卢邦贤) - piano & Ion Mazur - violin (Live), Ion Mazur: Classical music can be played everywhere !