Question: Which instrument does the band member Slipknot play that wrote Constitution Down?
Answer(s):
answer: Drums

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:music.composer.compositions ns:m.012ckd1b . 
?c ns:music.group_member.membership ?y .
?y ns:music.group_membership.role ?x .
?y ns:music.group_membership.group ns:m.0ntq7 .
}