Araya Diaz/Getty Images
Skrillex, when he was Sonny Moore of From First to Last, at the 2006 Vans Warped tour in San Francisco.
Stephen Albanese/Getty Images
A pre-pop-fame Katy Perry performing at the 2008 Warped Tour in Carson, California.
Daniel Boczarski/Getty Images
Hayley Williams of Paramore, with her signature neon hair, performing at the 2011 Vans Warped Tour in Milwaukee, Wisconsin.