Question: Give me a count of all the producers of all the movies whose music was done by James Horner?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:music <http://dbpedia.org/resource/James_Horner> . ?x prop:producer ?uri . }