Question: How many artists play as Rickenbacker?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE {?uri onto:instrument <http://dbpedia.org/resource/Rickenbacker> . ?uri rdf:type onto:Artist}