Question: What is the television show whose vocals are performed by  April Stewart and Mona Marshall?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/property/voices> <http://dbpedia.org/resource/April_Stewart> . ?uri <http://dbpedia.org/property/voices> <http://dbpedia.org/resource/Mona_Marshall> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/TelevisionShow>}