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());
String year = value(mp3s, String.valueOf(GregorianCalendar.getInstance().get(Calendar.YEAR)), new YearCallDispatcher());
parameters.put("album", album);
parameters.put("artist", artist);
parameters.put("comment", comment);
parameters.put("genre", genre);