Breathing is a basic need for every human being. Screaming is instinctive at birth and freedom is a gift. Freedom of breathing or screaming is not allowed to Madara. To escape his fate, he needs to put a mask on.
His rules are clear : don’t talk, don’t go out overdrawn. Hence, for now, music is his voice and the 2 red lines on his black mask stand for the voice he lost and freedom of breathing he cannot take. Watch out every details on Madara’s tracks, you may find out his secrets.