Earlier this month Metallica, Anthrax, Slayer, and Megadeth invaded Yankee Stadium with their 'Big Four' show. Before the show, Jose Mangin of MTV.com's 'Headbangers Ball' sat down with Metallica frontman James Hetfield, asking about the possibility of more 'Big Four' shows, their collaboration with Lou Reed, their upcoming 30-year-anniversary concerts in San Francisco and more. Check out their entire chat after the jump.