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 Profanatica - No Trumpet Shall Sound, Proclamation - Ceremonial Chants Of Blasphemy (Intro) + Nocturnal Damnation, Blasphemy - Emperor Of The Black Abyss