I'm a sucker for movie music because it's usually sort of dramatic and I like dramatic music. I like that aspect of the song.
I also like that it has a jazzy feel to it and that it just has a pretty melody to it. What really made me realize that I like this song though is that almost right off the bat, you can hear what sounds like a mistake- but the song continues on. This song has a unique form of beauty in music- the mix of conventional beauty with one more unique that sounds like a mistake at first. There's something beautiful to me about continuing on-despite the "mistake" (although I'm pretty sure in the case of this song, the "mistake" isn't really a mistake).
Maybe it's because I know my very apparent need for grace, my need for the love of God to continue to me despite my mistakes. He knew when He first started writing my "song" that I would make mistakes, but somehow He wove them in so that when they were combined with His love and grace, there's something beautiful to show for them.