Question: In what band did the artist who recorded "Knocking at Your Back Door" play?
Answer(s):
answer: Greg Kihn Band
answer: The G3 Jam
answer: Chickenfoot
answer: Deep Purple

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.featured_artist.recordings ns:m.0dshvwm . 
?c ns:music.group_member.membership ?y .
?y ns:music.group_membership.group ?x .
}