Statler and Waldorf -- Take Ten Terrific Girls, from episode 409 of The Muppet Show.
Vincent Price -- You've Got A Friend ; and The Delicious Monster; and Kermit Bites Vincent, from The Muppet Show, Season 1, Episode 19. Read Post
Roy Clark -- Sally Was A Good Old Girl, from episode 303 of The Muppet Show. Read Post