public void addAll(Collection<Artist> artists) {
   this.artists.addAll(artists);
   allSelectedArtists.setArtist(
       ResourceManager.getLabel("list.artist.all", locale)
           + " ("
           + (this.artists.size() - 1)
           + ")");
 }
 public void add(Artist artist) {
   this.artists.add(artist);
   allSelectedArtists.setArtist(
       ResourceManager.getLabel("list.artist.all", locale)
           + " ("
           + (this.artists.size() - 1)
           + ")");
 }