What is the HEAVIEST RIFF ever? SPIRITBOX, BARONESS, more weigh in

What's the heaviest riff of all time? Is it from a death metal song or a thrash ripper? A djent banger or a doom-metal lurcher? If anyone would know the answer, it'd be metal musicians themselves, so we asked members of Spiritbox, GWAR, Baroness, In Flames and more to weigh in with their picks for the weightiest guitar part in heavy-music history. Watch now.