What is METALLICA's greatest song? SPIRITBOX, GWAR, IN FLAMES, more weigh in

For metalheads, asking someone their favorite Metallica song is like asking a football fan to pick their favorite player. It's a required opinion for headbangers to have, and those opinions vary wildly from fan to fan. Some Metallica heads love 'em all. Some only acknowledge the thrash years. We turned to bigwig metal and rock musicians — including members of Spiritbox, GWAR, In Flames, Halestorm, and more — to pick their choice cuts from one of metal's all-time best discographies. Watch now.