Question: Who is the current owner of the team whose fight song is "Steelers Polka"?
Answer(s):
answer: Rooney family

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:sports.sports_team.fight_song ns:m.0j_8yp9 . 
?c ns:sports.professional_sports_team.owner_s ?x .
}