Question: Which genre of music performed by Richard Wagner appears in "Aida?"?
Answer(s):
answer: Opera

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:film.film_genre.films_in_this_genre ns:m.027195p . 
}