First Listen: Demi Lovato's 'Heart by Heart'

Demi Lovato's 'Heart by Heart' has been unveiled prior to the release of the new film 'Mortal Instruments: City of Bones' soundtrack. As expected from the previews that emerged last month, it is a ballad based almost entirely around a sorrowful piano harmony.

The singer's voice is on display here and her vocal range is truly impressive. The song was written by Diane Warren, who has penned a number of similar songs in the past.

Check out the new song here.

Demetria Devonne "Demi" Lovato is an American singer-songwriter, musician and actress. She made her debut as child actress inBarney & Friends. In 2008, she came to prominence as a starring cast member in the television film Camp Rock. She signed to Hollywood Records the same year, and released her debut studio album Don't Forget in September 2008. It has been certified Gold by the Recording Industry Association of America (RIAA). In 2009, Lovato was commissioned her own television series Sonny with a Chance. That year, her second album Here We Go Again became her first to debut atop the U.S.Billboard 200.