Rockstar Energy Drink Mayhem Festival, the world's largest touring heavy music festival, kicked off its fifth year yesterday (Saturday, June 30) at San Manuel Amphitheater in San Bernardino, California with a record-breaking attendance of 26,105 — 4,000 more than the previous attendance record set by the tour.The headlining slot on the main stage at Rockstar Energy Drink Mayhem Festival is occupied by SLIPKNOT. Next are thrash metal kings SLAYER, followed by the legendary MOTÖRHEAD). The main stage also spotlights a ferocious mix of today's best artists in a rotation, including THE DEVIL WEARS PRADA, AS I LAY DYING and ASKING ALEXANDRIA. Rockstar Energy Drink Mayhem Festival is produced by Rockstar Taste of Chaos organizer John Reese, Vans Warped Tour founder Kevin Lyman, Live Nation, and Creative Artists Agency. The team has made the Rockstar Energy Drink Mayhem Festival a standout on the summer concert circuit by following the proven model of utilizing sponsorship to deliver a lower ticket price and an enhanced concert experience. This year sees them joining forces once again with Rockstar Energy Drink as the title sponsor.