I was just having a debate with some other music historians and I said THE most underrated female singer of all time was Roberta Flack. She was the only female artist to have the number 1 song of the year in back to back years. She didnt sell the records of an Aretha or Diana and wasnt as world known as Whitney but she was OUR Queen and in my opinion she was the female version of Luther Vandross just extraordinary voice and deserves her place in music history. RIP!
Luther Vandross sang backup for Roberta Flack for some time. According to Luther's biography, Roberta "fired" him, saying that he was too good to be a career backup singer, and that it was time for him to do his own thing and shine...which he obviously did.