Music fans gather for the 'Gimme Shelter' rock concert at the Altamont Race Track in Altamont, Calif., on Dec. 6, 1969. The event was billed as a West Coast Woodstock, a huge free concert featuring Santana, the Grateful Dead, Crosby, Stills, Nash and Young and headlined by The Rolling Stones. Instead, that gathering 30 years ago turned into one of the most violent days in the history of rock 'n' roll, and signaled the end of the halcyon era of Flower Power. (AP Photo) Photo: AP