NEW YORK, N.Y. – September 30, 1968: Grace Slick and Paul Kantner of Jefferson Airplane in Concert in Central Park for a free concert on September 30, 1968 in New York, New York.. (Photo by MediaPunch/Shutterstock)
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)
