Question: Miguel de Cervantes wrote the musical extended from which book?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/author> <http://dbpedia.org/resource/Miguel_de_Cervantes> . ?x <http://dbpedia.org/ontology/basedOn> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Musical>}