Board Thread:Speculation House/@comment-10390252-20130603202911/@comment-14909251-20130905213834

Unless they plainly say the other songs are part of the canonical universe and sung by Weiss, I would not put much stock in their appearances in the show or trailers. We can safely presume Mirror, Mirror is part of the canonical universe since it is the only one Weiss was shown signing and is clearly about her.