Even tough their latest album, Death Magnetic, was only released last September Metallica have begun work on the follow-up.
"We're already jamming on new ideas and new riffs," bassist Robert Trujillo told LiveDaily.com. "That's one of the things with this band - there's no shortage of musical ideas. I think we still got it in us to create interesting music and to get even better with it. That's kind of fun."