Question: Which coaches headed the team the uses the fight song Skol Vikings?
Answer(s):
answer: Joe Woods
answer: Bud Grant
answer: Mike Zimmer
answer: Norm Van Brocklin
answer: Mike Tice
answer: Dennis Green
answer: Les Steckel
answer: Jerry Burns
answer: Leslie Frazier
answer: Brad Childress
answer: Mike Tomlin

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.095v49 . 
?c ns:american_football.football_team.historical_coaching_staff ?y .
?y ns:american_football.football_historical_coach_position.coach ?x .
}