Funny animal comic book parody of real singer Billy Joel. To maintain continuity, Marvel sticks things into different alternate universes. The Earth populated entirely by cartoon animals is called Earth-8311, and is filled with wonderfully mediocre animal puns like this one, and Mick Jaguar.
Billygoat Joel was mentioned in Peter Porker, The Spectacular Spider-Ham, #16 (July 1987). Peter Porker's girlfriend, Mary Jane Waterbuffalo is a big fan.