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 Pearl Fishers Duet - euphoniums: Dave Werden and Tim Morris, Liebesfreud - Euphonium Duet - Dave Werden, Tim Morris, Endearing Young Charms - Euphonium Duet