6th June 1969: Frank Zappa (1940 – 1993), lead singer with the Mothers of Invention, rehearsing for a concert at the Royal Albert Hall during his European tour. (Photo by Ron Case/Keystone/Hulton Archive/Getty Images)
June 1967: The Beatles at the EMI studios in Abbey Road, as they prepare for 'Our World', a world-wide live television show broadcasting to 24 countries with a potential audience of 400 million. (Photo by Keystone/Getty Images)
LOS ANGELES – 1967: Psychedelic rock band The Peanut Butter Conspiacy (L-R John Merrill, Bill Wolff, Barbara Robison aka Sandi Peanut Butter, Jim Voight and Alan Brackett) poses for a portrait in 1967 in Los Angeles, California. (Photo by Michael Ochs Archive/Getty Images)
American country music and gospel singer Jeannie C. Riley, UK, 20th November 1968. (Photo by William Lovelace/Daily Express/Hulton Archive/Getty Images)
Portrait of the American singing group Peter (Yarrow), Paul (Stookey) and Mary (Travers) on "The Jack Benny Program," circa 1963. (Photo by Hulton Archive/Getty Images)
The Beatles performing their last live public concert on the rooftop of the Apple Organization building for director Michael Lindsey-Hogg's film documentary, 'Let It Be,' on Savile Row, London, UK, 30th January 1969; drummer Ringo Starr sits behind his kit, singer-songwriters Paul McCartney and John Lennon (1940 – 1980) perform at their microphones, and guitarist George Harrison (1943 – 2001) stands behind them. Lennon's wife Yoko Ono sits at right. (Photo by Evening Standard/Hulton Archive/Getty Images)
