What’s better than watching the Big 4 play together? How about the Magnificent 7? Some 60,000 festival-goers hoping to watch Metallica, Slayer, Megadeth and Anthrax perform together on stage at Knebworth got more than they bargained for when members of seven bands joined forces to jam the Diamond Head classic ‘Am I Evil’ at Sonisphere UK. Alongside members of the Big 4, Andreas Kisser from Sepultura (filling in for Anthrax’s Scott Ian), Gary Holt from Exodus (doing a Jeff Hanneman impression for Slayer) and fittingly Brian Tatler from Diamond Head all thrashed it out. That’s one show you’re pretty much guaranteed to never see again.

Of course, any show is only as good as those who shout about it when they show up to see it. And the audience at Knebworth were as good as it gets. As James Hetfield put it on stage: “You kick ass.”