#List artists features in segments
PREFIX po: <http://purl.org/ontology/po/>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>

SELECT DISTINCT ?artistName WHERE {

   ?seg a po:Segment;
      po:track ?track.

   ?track foaf:maker ?artist.

   ?artist foaf:name ?artistName.
}
ORDER BY ?artistName