Finding the links where you can download an Album or a Track for free

From Music Ontology Wiki

 1        PREFIX mo: <http://purl.org/ontology/mo/>
 2        SELECT ?download_link_album ?download_link_track
 3        WHERE 
 4        {
 5            {
 6                <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> a mo:Record;
 7                                                                                       mo:freedownload ?download_link_album.
 8            }
 9            UNION
 10           {
 11               <http://mm.musicbrainz.org/record/a89e1d92-5381-4dab-ba51-733137d0e431> mo:has_track ?track.
 12               ?track a mo:Track;
 13                      mo:freedownload ?download_link_track.
 14           }
 15       }