Singer-songwriter Joni Mitchell provides backing vocals during the recording of Carole King's album 'Tapestry' at A&M Records Recording Studio in January 1971 in Los Angeles, California, United States. (Photo by Jim McCrary/Redferns)
Denny Doherty, Michelle Phillips, John Phillips and Mama Cass Elliott have an acoustic guitar jam and picnic in circa 1966 in a park. (Photo by Michael Ochs Archives/Getty Images)
LOS ANGELES – SEPTEMBER 1966: Country musician Merle Haggard (C) and his band "Merle Haggard & the Strangers" including Roy Nichols pose for a September 1966 portrait in Los Angeles, California. (Photo by Michael Ochs Archives/Getty Images)
NEW YORK – 1967: Experimental, psychedelic, electronic rock group United States of America (L-R: Gordon Marron, Rand Forbes, Joseph Byrd, Dorothy Moskowitz and Ed Bogas) pose for a portrait in 1967 in New York City, New York. (Photo by Michael Ochs Archives/Getty Images)
The Beatles show off their MBE medals after the royal investiture at Buckingham Palace, London, Tuesday 26th October 1965. The Beatles, each is now a Member of the Order of the British Empire. Pictured at news press conference held at the Saville Theatre. (Photo by Barham/Tony Eyles/Mirrorpix/Getty Images)
THE JOHNNY CASH SHOW – Airdate: April 1, 1970. (Photo by ABC Photo Archives/Disney General Entertainment Content via Getty Images)SHEL SILVERSTEIN;JOHNNY CASH
