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 Therion - An Arrow from the Sun, Christmas Metal Symphony - The Phantom of the Opera (Russell Allen & Floor Jansen - Andrew Lloyd Webber/Nightwish cover), Monsters of Metal - Stand Up and Shout (Dio)