"We promised our fans we'd play a new song and we've been writing and creating away and we're going to throw something at them on Sunday," Ulrich told Rolling Stone last week. "We have something lined up that is fairly representative of where our creative headspace is at right now. It's one of those things that's like, 'Here, we're writing and we're creating.'"

But while the song sounds fully crafted, Ulrich says things change. "We did the same thing when we went out and played a bunch of dates in 2006," he says. "We were writing and played two different new songs over the course of that summer, and none of them made the record [Death Magnetic]. One was called 'New Song 1' - going out on a creative limb, here - and the other was called 'New Song 2.' That's how deep we went. There was a couple of pieces in 'New Song 1,' some of the middle bit ended up in 'All Nightmare Long,' and the intro bit ended up in 'The End of the Line.' That's how we work; stuff just gets changed around, moved over and this goes over there and the rest of that gets sacked and that ends up in the intro in song five." [Laughs]