public MusicFileLoader() {
		File home = new File(START_DIR);
		for (File dir : home.listFiles()) {
			if (dir.isDirectory()) {
				if (!categories.contains(dir.getName()))
					categories.add(dir.getName());
				for (File music : dir.listFiles()) {
					if (music.isFile()
							&& music_type.contains(new MimetypesFileTypeMap()
									.getContentType(music))
							&& getRightPartFilename(music.getName()).toLowerCase().equals("mp3"))
						music_list.add(new MusicFile(this
								.getLeftPartFilename(music.getName()), dir
								.getName(), music.toURI().toString()));
				}
			}
		}
	}