Prince
From Muppet Wiki
Prince Rogers Nelson (b. 1958) appeared as a guest star in episode 201 of Muppets Tonight on September 13, 1997. At the time, he was known as 
(dubbed by the media as the Artist Formerly Known as Prince). A Muppet caricature of the star appeared in the same episode.
Twelve years before, in 1985, Prince's original score for the movie Purple Rain defeated Jeff Moss' score for The Muppets Take Manhattan at the Academy Awards.
