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ATLANTA - February 14: Jimmy Carter and Singers/Songwriters James Brown attend Former Governor of Georgia Jimmy Carter's fundraiser for his 1976 Presidential run at Royal Coach Inn Atlanta Georgia February 14, 1976 (Photo By Rick Diamond/Getty Images)

ATLANTA - February 14:  Jimmy Carter and Singers/Songwriters James Brown attend Former Governor of Georgia Jimmy Carter's fundraiser for his 1976 Presidential run at Royal Coach Inn Atlanta Georgia February 14, 1976  (Photo By Rick Diamond/Getty Images)

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Portrait of the singer Nina Simone, October 1969. (Photo by Jack Robinson/Hulton Archive/Getty Images)

Portrait of the singer Nina Simone, October 1969. (Photo by Jack Robinson/Hulton Archive/Getty Images)

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NEWPORT, UNITED STATES - JULY 4: Nina Simone performs on stage at Newport Jazz Festival on July 4th 1968 in Newport, Rhode Island. Image is part of David Redfern Premium Collection. (Photo by David Redfern/Redferns)

NEWPORT, UNITED STATES - JULY 4: Nina Simone performs on stage at Newport Jazz Festival on July 4th 1968 in Newport, Rhode Island. Image is part of David Redfern Premium Collection. (Photo by David Redfern/Redferns)

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Curtis Mayfield, portrait, London, 26th January 1972. (Photo by Michael Putland/Getty Images)

Curtis Mayfield, portrait, London, 26th January 1972. (Photo by Michael Putland/Getty Images)

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UNSPECIFIED - JANUARY 01: Photo of Curtis Mayfield (Photo by Michael Ochs Archives/Getty Images)

UNSPECIFIED - JANUARY 01:  Photo of Curtis Mayfield  (Photo by Michael Ochs Archives/Getty Images)