Name the musical artists whose label is given by Kobalt Label Services?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/label> <http://dbpedia.org/resource/Kobalt_Label_Services>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MusicalArtist>}
Kobalt_Label_Services