code: def lookup_track(self, track):
          
          tracks = Track.objects.filter(title__iexact=track.title)
          for track_obj in tracks:
              for contributor in track_obj.get_primary_contributors(permitted=False):
                  if contributor.title == track.artist:
                      return track_obj
          return None
docs: Looks up Django Track object for provided raw importing track object.