Singer Anthony Kiedis (L) and bassist Michael "Flea" Balzary, of the Los Angeles-based rock band, Red Hot Chili Peppers, perform during a show in Bilbao April 18, 2006. The show, a 500 seat invitation-only concert next to the Guggenheim museum, was held to promote "Stadium Arcadium", a double CD produced by [Rick Rubin, and the groups first studio album since 2002's "By the way"].