machine_question: what is the name of the the sports team with the fight song Steelers Polka head coach
question: Who is the current head coach of the team the uses the song title "Fight Polka"?
sparql: 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:american_football.football_team.current_head_coach ?x .
  }
  
webqsp_question: what is the name of the pittsburgh steelers head coach