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 Europa Universalis IV - Original Soundtrack / OST - The sound of summer, Company of Heroes 2 Original Soundtrack/OST - 15 - Gather Your Forces, Company of Heroes 2 Original Soundtrack/OST - 25 - The Long Winter