Killswitch Engage and Mushroomhead have also recorded tracks for the collection, which features samples of audio used during season four of the massive HBO hit series. Season five airs from next month.

In January, Anthrax's Scott Ian revealed his band sacrificed a track from their upcoming album for the release, while Killswitch Engage frontman Jesse Leach reported that his band's contribution featured "massive riffs" and he was "pretty stoked" with the result.