Kirk Hammett sings Iron Maiden, James Hetfield rocks out to Slayer

Metallica's Kirk Hammett and Rob Trujillo played a cover of Iron Maiden's classic 'Killers' at a recent London show, Loudwire reports. It's a rare occasion to hear Hammett sing, and he can't really sing, neither can Trujillo. Which is exactly why this is so cool - they had the guts to do something they most certainly know they're not good at, but the still did it, in front of big crowds (watch the video below). James Hetfield posted a video on Instagram of himself rocking out to Slayer, while driving on the highway - "SLAYING makes me happy" papa Het says.