Question: The singer who wrote the lyrics for "Joe Williams' Blues" sings in what style of music?
Answer(s):
answer: Blues
answer: Swing music
answer: Ballad
answer: Jazz
answer: Vocal jazz
answer: Bebop
answer: Traditional pop music

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.lyricist.lyrics_written ns:m.01082g_w . 
?c ns:music.artist.genre ?x .
}