Blockbuster films like Twilight and The Hunger Games have produced soundtracks that have topped the Billboard 200 album charts. The upcoming teen flick The Mortal Instruments: City of Bones is hoping for similar success with its accompanying album. It chances look good with a new track by Demi Lovato.

"Heart By Heart" is, at its core, a pop ballad but with a gritty, rock edge. it showcases The X Factor judge's powerful vocals, particularly when she lets it rip at the end with a major diva belt.

Mortal Instruments has also tapped Bassnectar, Ariana Grande, Zedd, Colbie Caillat for its August 20 soundtrack, which drops one day before the film is released.