Rockstar Energy Drink Mayhem Festival - San Francisco, CA

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Robb Flynn of Machine Head performs as part of the Rockstar Energy... News PhotoArts Culture and Entertainment,California,Horizontal,Live Event,Machine Head,Mountain View - California,Music,Performance,Shoreline Amphitheatre,Stage - Performance Space,USA,Waist UpPhotographer Collection: Getty Images Entertainment 2013 Tim MosenfelderMOUNTAIN VIEW, CA - JUNE 30: Robb Flynn of Machine Head performs as part of the Rockstar Energy Drink Mayhem Festival at Shoreline Amphitheatre on June 30, 2013 in Mountain View, California. (Photo by Tim Mosenfelder/Getty Images)