Board Thread:Speculation House/@comment-10390252-20130603202911/@comment-14909251-20130905041446

Weiss should break out this number.

On a more serious note, I think the music being used in-universe should not be given too much attention. I imagine Mirror, Mirror is the only song she actually sang in-universe of the ones that exist. She may be a singer, but she is probably not some well-known pop singer or even a professional singer. Her parents likely just indulge her habits to a ridiculous level so that she can do major concert performances on a whim. Of course, since the concert hall seems to belong to her family, that is pretty easy.