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 Timpani Solo: Intrada from Triptych - Eldad Shiloah played by Joe Porter, Groove Train - Concerto for Drum set, Percussion Ensemble, Brass, and Woodwinds by Joe Porter, Philip Glass - String Quartet No.5, Mvt V on Marimbas