Theme song?

It plays during the end credits, I think it fits the movie really well.

i think that its just the singer i just love that song also when the guy dies its realy sad because when ever i watch a movie and a main carcter dies its sad :(

Yeah My Heart Will Go On is the theme of the movie. Though during movie it's the instrumental part of the song it's still the main theme of movie. If you watch movie enough you can hear the song without the words through out the whole movie. And the song itself plays during credits.