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 Traumerei by Schumann for Cello Duet, Vivaldi's 2 Celli Concerto for Five Cellos, J.S. Bach's Goldberg Variation No.25 for Cello Trio