Radios on what topics can be tuned in to in Washington DC?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/broadcastArea> <http://dbpedia.org/resource/Washington,_D.C.> . ?x <http://dbpedia.org/ontology/programmeFormat> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/RadioStation>}
Washington,_D.C.