after True Zonda uses her special, and Joule talks to you about not needing her song to fight, GV comes to terms that he doesn't need Joule to sing because her song is always with him (cheesy, but it works in this context). meaning that the game breaks the 4th wall. GV sings Joule's song. but the 4th wall break is that the player is the singer. you start seeing the song's subtitles and you sing.