Question: What type of music featured in the album Nightingale that Richard Wagner played?
Answer(s):
answer: Classical music

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06c44)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06c44 ns:music.artist.genre ?x .
?x ns:music.genre.albums ns:m.0105s4cj . 
}