Question: In a 1991 concert tour in Japan called George Harrison-Eric Clapton, what was the name of the guitar the artist used?
Answer(s):
answer: Gibson SG
answer: Fender Stratocaster

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.artist.concert_tours ns:m.0zgbdpg . 
?c ns:music.guitarist.guitars_played ?x .
}