TRACY, CA – DECEMBER 6: English singer, songwriter, actor, and film producer Mick Jagger of the English rock band The Rolling Stones performs as Hell's Angels guard the stage during the Altamont Speedway Free Festival, which was a counterculture rock concert held on Saturday, December 6, 1969, at the Altamont Speedway in Tracy, California. (Photo by Jeff Hochberg/Getty Images)
