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 Band - Bandology (Concert March) - Eric Osterling, Orchestra - Caravan - Duke Ellington / arr. by D. Ployhar, District String Orchestra - Rumble in the City (Stephen Bulla)