What musicians are signed up with colpix records?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/label> <http://dbpedia.org/resource/Colpix_Records>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MusicalArtist>}
Colpix_Records