Listen: Demi Lovato’s Ballad ‘Heart By Heart’ From ‘Mortal Instruments’ Soundtrack

Hey Mortal Instruments fans: get ready to have this song on repeat all weekend long as you continue to count down the days until the film’s arrival.

Demi Lovato’s powerful balled “Heart By Heart,” a track recorded just for the film, was unveiled to the masses (ie. it probably leaked on Friday).

Lovato, 20, is just one of several big names on the official soundtrack, out Aug. 20. Ariana Grande and Nathan Sykes, Colbie Caillat and Jessie J also have songs on the album.

The Mortal Instruments: City of Bones, starring Lily Collins, Jamie Campbell Bower, Kevin Zegers and Robert Sheehan, opens in theaters Aug. 21.

Check out the lyrics for “Heart By Heart” at Directlyrics.