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 Halo 3 OST #5 Crow's Nest: Last of the Brave, Halo 2 Volume 1 OST #14 Orbit of Glass, Halo 3 OST #4 Crow's Nest: Honorable Intentions