Question: What brand of guitar as used by the producer of Gone Troppo?
Answer(s):
answer: Fender Stratocaster
answer: Rickenbacker 360/12

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.producer.releases_produced ns:m.01jgv3n . 
?c ns:music.guitarist.guitars_played ?x .
}