Heavy metal is for outsiders, we know that. Its aggression and subversive ideology ensure its anchorage to the underground, regardless of the offshoots which break the mainstream from time to time. That's the reason it will last a lifetime, but take a moment to consider the people swept up by those commercial trends, the fans for whom the passing of time has dragged them kicking and screaming from the music they loved. Nu metal is a prime example. While the more recent phenomenon of commercial metalcore continues to pump out fringed riff-peddlers some eight years on, it's been slim pickings for the brutish, protein-shake types since the turn of the millennium. Although Five Finger Death Punch play a much updated and far from pure version of what nu metal was (they notably feature guitar solos, previously the genre's kryptonite) the all-American stars fill the gap perfectly. They're heroes.