English Rock group the Rolling Stones perform onstage at an unspecified venue, mid to late 1960s. Pictured are, from left, Keith Richards and Brian Jones (1942 – 1969), both on guitars, and vocalist Mick Jagger. (Photo by Silver Screen Collection/Getty Images)
American musicians Paul Simon (left) and Art Garfunkel of the folk duo Simon & Garfunkel perform together on a television show at BBC Television Centre in London in 1967. (Photo by David Redfern/Redferns)
American psychedelic rock band Beacon Street Union, circa 1966. From left to right, they are guitarist Paul Tartachny, bassist Wayne Ulaky, drummer Richard Weisberg, singer John Lincoln Wright and keyboardist Robert Rhodes. (Photo by Don Paulsen/Michael Ochs Archives/Getty Images)
Country Singer Patsy Cline performs on stage at the Riverside Ball Room in Phoenix, Arizona, circa 1960. (Photo by Johnny Franklin/andmorebears/Getty Images)
LOS ANGELES – JUNE 1: Country star Glen Campbell records at the Capitol Records studios on June 1, 1967 in Los Angeles, California. (Photo by Jasper Dailey/ Michael Ochs Archives/Getty Images)
