The Mirror Mirror (Original Motion Picture Soundtrack) will be released on April 10th with mostly instrumental music composed by Alan Menken, yes, the Menken of a majority of the most successful Disney projects of the last 20 years or so.
The CD is supplemented with two remixes of "I Believe in Love" performed by Snow White herself, Lily Collins. I have a video of the Mirror, Mirror remix below from a fan. It also provides somewhat of a preview of the movie.
It is really hard to believe these two movies--this one and the upcoming Snow White and the Huntsman--are inspired by the same fairy tale, isn't it? So is the power of fairy tales!