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 Pokemon RSE/ORAS - Route 120 (Horn and Euphonium cover), Tetris Theme A for Brass Quartet, The Legend of Zelda: Wind Waker - Great Sea theme (euphonium multitrack)