Mandatory Credit: Photo by Anonymous/AP/Shutterstock (6650142a) Mick Jagger Mick Jagger sings at the Altamont Rock Festival at Livermore, Calif. on while Hells Angels cross stage during melee to help fellow motorcyclists. The Rolling Stone hired the Hells Angels to police the concert for $500 worth of beer Stones Altamont, LIVERMORE, USA
