Question: What instrument did the composer of "Maple Leaf Rag" play?
Answer(s):
answer: Piano
answer: Jazz piano

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.03hbnf . 
?c ns:music.group_member.instruments_played ?x .
}