}
List<PlaylistDTO> playlists = new ArrayList<PlaylistDTO>();
for (String tmp : this.playlists) {
Playlist p = getPlaylistFromId(tmp);
playlists.add(new PlaylistDTO(p.getName(), p.getSongs()));
}
MusicLibraryDTO library = new MusicLibraryDTO(map, playlists);
library.setPreferred_artist(getPreferredArtist());