What is the song from Romeo & Juliet?

In the modern version of the film, with Leo DiCaprio in it, when Romeo and Juliet are getting married there is a gospel type choir singing a great song. I know DJ Ironik did do a version of it but does anybody know where i can find the movie version (it's not on the soundtrack cd) and could you tell me if DJ Ironik's version was the original or not. Thanks, much appreciated.