private void common(Map<String, Object> parameters) {
DirectoriesModel model = new DirectoriesModel("music/"+parameters.get("directory"));
File directory = model.getDirectory();
String parent = new File(directory.getParent()).getName();
List<File> files = new ItemsModel("music/"+parameters.get("directory"),"", Extension.mp3.toString()).asList();
List<Mp3> mp3s = new FileMp3Converter().convert(files);
String artist = value(mp3s, parent, new ArtistCallDispatcher());
String album = value(mp3s, directory.getName(), new AlbumCallDispatcher());
String comment = value(mp3s, "MediaCentre", new CommentCallDispatcher());
String genre = value(mp3s, Genre.Undefined.toString(), new GenreCallDispatcher());