Who sang the song "Summertime"?

I am trying to find out who sings a certain version of "Summertime". All I can tell you is that it is by a black male R&B/soul/funk singer and it has a strong beat (maybe with some bongos or something), and he uses a lot of bop's and mmmm's and sound like that throughout. I also know that it is not Sam Cooke, Otis Redding, or Wilson Pickett.