anchor.diff:    }
   }
   
  -IconButton pauseButton() => IconButton(
  +IconButton pauseButton(Color color) => IconButton(
         icon: Icon(Icons.pause),
  +      onPressed: AudioService.pause,
         iconSize: 24.0,
  -      onPressed: AudioService.pause,
  +      color: color,
       );
   
  -IconButton playButton() => IconButton(
  +IconButton playButton(Color color) => IconButton(
         icon: Icon(Icons.play_arrow),
  +      onPressed: AudioService.play,
         iconSize: 24.0,
  -      onPressed: AudioService.play,
  +      color: color,
       );
   
  -IconButton nextButton() => IconButton(
  +IconButton nextButton(Color color) => IconButton(
         icon: Icon(Icons.skip_next),
  +      onPressed: AudioService.skipToNext,
         iconSize: 24.0,
  -      onPressed: AudioService.skipToNext,
  +      color: color,
       );
  -
  -class CurrentSongState {
  -  final Song song;
  -  final Duration position;
  -
  -  CurrentSongState(this.song, this.position);
  -}
  
positive.code:                           mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              Text(
                                state.song.title,
                                style: Theme.of(context).textTheme.subtitle2,
                                overflow: TextOverflow.ellipsis,
                                maxLines: 1,
                              ),
                              Text(
                                state.song.artist,
                                style: Theme.of(context).textTheme.caption,
                                overflow: TextOverflow.ellipsis,
                                maxLines: 1,
                              ),
  
negative.code:                           return Row(
                              mainAxisAlignment: MainAxisAlignment.center,
                              children: [
                                if (playing) pauseButton(foregroundColor) else playButton(foregroundColor),
                                nextButton(foregroundColor), // TODO grey out when cannot skip next
                              ],
                            );
                          },
  