Question: What are the instruments utilized by the person who as taught at Stratford Northwestern Secondary School?
Answer(s):
answer: Vocals

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:people.person.education ?k .
?k ns:education.education.institution ns:m.02w1qmc . 
?c ns:music.group_member.membership ?y .
?y ns:music.group_membership.role ?x .
}