The Fort Rock musicians join with festival organizers in urging fans to sign the 'Students Fighting Guns Since Adults Won't' petition for discounted tickets.
Soundgarden, A Perfect Circle, The Offspring, Def Leppard, Papa Roach and Chevelle are among the acts playing the Welcome to Rockville and Fort Rock festivals.
Every year from late April through May, several rock festivals are held across the United States, and are collectively known as the 'World's Loudest Month.'