LOS ANGELES – 1963: Entertainer and singer Nat "King" Cole poses for a portrait session in Los Angeles, California in 1963. (Photo by Michael Ochs Archives/Getty Images)
American country music singer Loretta Lynn rests her head on her hand and reclines on a couch near some audio equipment, February 24, 1975. (Photo by CBS Photo Archive/Getty Images)
American soul singer and pianist Ray Charles sings on stage during his first British concert appearance at Finsbury Park, London, England, May 13, 1963. (Photo by Express Newspapers/Getty Images)
circa 1966: Headshot of American actor and singer Nancy Sinatra, daughter of the American actor and singer Frank Sinatra, smiling over her shoulder and looking to the side. (Photo by Max B. Miller/Fotos International/Getty Images)
Singer and songwriter Glen Campbell in a recording studio at Capitol Records on December 15, 1966 in Los Angeles, California. (Photo by Jasper Dailey/Michael Ochs Archives/Getty Images)
American singer and musician Buck Owens (1929 – 2006) on the set of 'The Jimmy Dean Show', USA, 13th November 1964. (Photo by Don Paulsen/Michael Ochs Archives/Getty Images)