Question: Who made the singles on the famous album Aida?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/album> <http://dbpedia.org/resource/Elton_John_and_Tim_Rice's_Aida> . ?x <http://dbpedia.org/ontology/musicalArtist> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Single>}