This Sunday, country superstar Hank Williams Jr. will add his name to the long list of celebrities, including Elizabeth Taylor, Dustin Hoffman and Paul McCarthy, who have lent their vocal talent to television's animated sitcom, The Simpsons. Williams' voice will be heard singing a commercial jingle for a fictional vehicle called the "Canyonero." The commercial, in typical Simpsons form, is a humorous satire on the current sport utility vehicle craze. "My little girl, Katie, watches the show and I also get a chance to catch it sometimes," says Williams. "One of the reasons that I did is because I thought it would be a thrill for my two youngest children to get to hear Daddy's voice on a cartoon show." The episode, also features the voices of comedians Jay Leno, Stephen Wright, Bobcat Goldthwait and Janeane Garofalo.