AppBar(
        title: BlocBuilder<MusicPlayerBloc, MusicPlayerState>(builder: (_, state) {
          if (state is MusicPlayerPlaying) {
            return Text('Playing: ${state.musicTitle}');
          } else if (state is MusicPlayerPaused) {
            return Text('Paused');
          } else {
            return Text('Music Player');
          }
        }),
      );