premise: Sonny & Cher are award-winning R&B singers.
hypothesis: James Forman ( born March 27 , 1946 ) , better known by his stage name James Mtume , is an American Grammy Award-winning R&B musician , songwriter and radio personality . Sonny & Cher were an American pop music duo , actors , singers and entertainers made up of husband-and-wife Sonny and Cher Bono in the 1960s and 1970s .