Question: What Characters does actor Seth McFarlane play in the program witht he theme song "Family guy theme song?
Answer(s):
answer: Kevin Swanson
answer: Carter Pewterschmidt
answer: Glenn Quagmire
answer: Tom Tucker
answer: Mickey McFinnegan
answer: Stewie Griffin
answer: God
answer: Peter Griffin
answer: Brian Griffin
answer: Kool-aid Guy
answer: Seamus
answer: Jasper
answer: Dr. Elmer Hartman
answer: Nate Griffin
answer: Jake Tucker

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:tv.tv_program.theme_song ns:m.0n9cghm . 
?c ns:tv.tv_program.regular_cast ?y .
?y ns:tv.regular_tv_appearance.character ?x .
?y ns:tv.regular_tv_appearance.actor ns:m.021yw7 .
}