Maggie Simpson

The "Holidays of Future Passed" episode (December 11, 2011) of long running animated Fox comedy television series The Simpsons is set in the future. Baby Maggie is now all grown up and a rock star, "the voice of her generation."

Is that all of them now? Has every member of the Simpsons family been a musician/singer of some kind, in some form, in some episode? If we count "Treehouse of Horror" episodes, then I think so! Mission accomplished!