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 Karol Brull & Viktoria Bolender: Violin appassionata (dance), Piazzolla: Double Concerto for bandoneon, guitar & orch. II, Castelnuovo-Tedesco - Quintet - I Allegro