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 The Falling Sky - Funeral Music for a tormented soul (Acustic Version), Haydn: Double Concerto for Violin, Piano and String Orchestra, Haydn: Double Concerto for Violin, Piano & String Orchestra (Presto)