Conversation so far:
when did tom petty started acting?
in 1978
Can you tell me that film's name tom Petty acted in 1978?
the name of the film is FM
did tom Petty  star with anyone notable in the film FM?
Tom Petty appeared in the 1997 film The Postman, directed by and starring Kevin Costner
how about shows Tom Petty Starred in?
in 2002, he appeared on The Simpsons

Question: What role did tom have on the simpsons?
Self-contained rewrite: What role did tom Petty have on the simpsons in 2002?