If you can't get enough new music from Demi Lovato, especially after her recent album release, it's your lucky day. It just got announced that the musician is joining the lineup for the soundtrack of The Mortal Instruments. It's a big deal to be included on a movie soundtrack -- and since this movie is super anticipated by fans of the Cassandra Clare book series, it seems to be an even bigger deal. So to break it down, Demi recorded a song for the first movie in the story. It's called Heart By Heart. Also on the soundtrack, Colbie Callait recorded a track called When The Darkness Comes, Jessie J added a musical arrangement called Magnetic, plus there are additions from AFI, Youngblood Hawke, Pacific, Jetta and others. The full list -- with actual song titles -- are compiled for you to check out for yourself -- just click the link below. But based on what you know about The Mortal Instruments: City of Bones, what do you think Demi's Heart By Heart will sound like??.