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 W.A.Mozart - Divertimento for Trio No.4 K.Anh.229(K.439b) (2Cl/Bsn), Dvorak - Wind Quintet "American" (Arr. by D.Walter) - I. Allegro ma non troppo