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 Victor Ewald - Brass Quintet No. 1 - Mvt. 1, That's a Plenty - Thoroughbred Brass Quintet, Vivaldi - Concerto in A minor for Brass Quintet