Question: Who played Betty Rizzo in the movie with the soundtrack "Grease: The Musical"?
Answer(s):
answer: Stockard Channing

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:film.film.soundtrack ns:m.01mf1cy . 
?c ns:film.film.starring ?y .
?y ns:film.performance.actor ?x .
?y ns:film.performance.character ns:m.0fqbs6 .
}