def build(self):
"""Build GUI"""
music_player = MusicPlayer()
gui_widget = GUI(self, music_player)
music_player.add_gui(gui_widget)
network_handler = NetworkHandler(music_player, gui_widget)
music_player.add_network_handler(network_handler)
gui_widget.add_network_handler(network_handler)
self.gui_widget = gui_widget
return gui_widget
