Looks up Django Track object for provided raw importing track object.

def lookup_track(self, track):
        """
        Looks up Django Track object for provided raw importing track object.
        """
        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