Question: Give me a count of musical artists collaborating with Waylon Jennings?
SPARQL:
SELECT DISTINCT COUNT(?uri) WHERE {?uri <http://dbpedia.org/ontology/associatedMusicalArtist> <http://dbpedia.org/resource/Waylon_Jennings>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MusicalArtist>}