Screens*
  Logged-out
    login -> Logged-in
  Logged-in&
    SDK
      Loading-sdk
        loaded-sdk -> Loaded-sdk
      Loaded-sdk
        Player
          Loading-player
            loaded-player -> Loaded-player
          Loaded-player
    Music
      Loading-music
        loaded-music -> Loaded-music
      Loaded-music
        play-only-if-loaded-player -> Playing
  Sound
    Silent
    Playing