Rockstar Energy Drink Mayhem Festival - San Francisco, CA

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Troy Sanders and Bill Kelliher of Mastadon perform as part of the... News PhotoArts Culture and Entertainment,California,Horizontal,Live Event,Mastodon - Band,Mountain View - California,Music,Performance,Shoreline Amphitheatre,Stage - Performance Space,Troy Sanders,USA,Waist UpPhotographer Collection: Getty Images Entertainment 2013 Tim MosenfelderMOUNTAIN VIEW, CA - JUNE 30: Troy Sanders (L) and Bill Kelliher of Mastadon perform 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)