Who sings what a man what a man what a mighty good man?

Answer 1

Salt N Pepper & En Vogue :-)

The chorus is taken from the 1968 Stax hit "What a Man" by Linda Lyndell, written by Dave Crawford. "What a Man's" chorus of "What a man, what a man, what a man, what a mighty good man" is also repurposed for this recording.

Ref Wikipedia.