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 Violin Concerto in E Major 3rd Mvt., Beethoven Sonata op.24 for Piano and Violin "spring" 2nd mvt., Beethoven Sonata op.24 for Piano and Violin "spring" 4th mvt.