For Roadrunner's 25th anniversary, the pioneering heavy metal/hard rock label came up with a novel concept: four super groups composed of current and former Roadrunner artists, with more Roadrunner alumni guesting on each track. ROADRUNNER UNITED: THE ALL-STAR SESSIONS is the result. Based on core bands led by Slipknot drummer Joey Jordison, ex-Fear Factory guitarist Dino Cazares, Machine Head guitarist/vocalist Robert Flynn, and Trivium leader Matthew Heafy, the album covers a wide swath of aggressive styles, from the proggy thrash/death metal of "Annihilation by the Hands of God" to the old-school stoner boogie grooves of "Blood and Flames."