Question: Who is the voice actor for Eric Cartman on the TV show with the theme song "South Park Theme Song?"?
Answer(s):
answer: Trey Parker

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.0n9ch97 . 
?c ns:tv.tv_program.regular_cast ?y .
?y ns:tv.regular_tv_appearance.actor ?x .
?y ns:tv.regular_tv_appearance.character ns:m.0myj0 .
?y ns:tv.regular_tv_appearance.special_performance_type ns:m.02nsjvf .
}