Soul legend Gladys Knight is still bitter pal Stevie Wonder didn't ask her to record UNTIL YOU COME BACK TO ME (THAT'S WHAT I'M GONNA DO) after she spent hours perfecting the classic song with him. Knight sang the song for Wonder as he was writing it on the road - and then he gave it to Aretha Franklin. The RAINY NIGHT IN GEORGIA singer recalls, "(Stevie and I) were on tour together, and he used to make me come and sing every day after the show. "I would say, 'Stevie, we just got done with a show and we've got four more to do (this week),' but he would be like, 'Oh, come on, Gladys. Just sing this part.'" Months later, Knight was horrified when she heard the tune on the radio: "I hear Aretha Franklin singing, 'I'm gonna rap on your door...' I said, 'You've got to be out of your mind. What happened to my song? "Everytime I would see Stevie, I would tell him... Nobody talks about that song."