Polish Extreme Metallers Behemoth opening up for Slipknot? Who wrote that script? Well they did. Here’s their full set from The O2 Arena on 25th January 2020. People have a history of turning up purely for the headliner, so if they did, oh man, did they miss out. “I Loved You At Your Darkest” is their eleventh studio album out now via Nuclear Blast. Go listen. It needs to be heard.