List all the artist of albums which have been produced by Stephen Kozmeniuk ?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/producer> <http://dbpedia.org/resource/Stephen_Kozmeniuk> . ?x <http://dbpedia.org/property/artist> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Album>}
Stephen_Kozmeniuk