from kivy.uix.screenmanager import Screen, ScreenManager


class WindowManager(ScreenManager):
    pass


class StartScreen(Screen):
    pass


class SpectrumScreen(Screen):
    pass


class TuneScreen(Screen):
    pass


from kivy.uix.screenmanager import Screen, ScreenManager


class WindowManager(ScreenManager):
    pass


class StartScreen(Screen):
    pass


class SpectrumScreen(Screen):
    pass


class TuneScreen(Screen):
    pass

