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 Rachmaninov | Suite pour deux pianos n°1 Op. 5 - Mvnt1, Bartok | Sonata for 2 Pianos and Percussion Sz.110, 3rd Mvt, Tchaïkovski | Sérénade pour orchestre à cordes Op. 48 - Mvnt1 (extrait)