DN Theme

What is the purpose of background music in a film? To help tell the story, of course. And the best soundtracks (with a few exceptions) disappear. They are still there, and somewhere in the back of your mind you hear it, but you are too engrossed in the story to think 'oh, there is some good background music'. The music brings the story to life without letting you know it is there.
The funny thing about music that good is that you don't realize the fact until you hear it apart from the film. I love it when I can listen to a song that I have never heard standalone, and say 'That is when so-and-so was fighting the bad guy!', because the song isn't just music to me, it is the actual story in a different form.
The main theme from Death Note is like that to me. Perhaps you have to watch the whole show to fully understand, but like all music of it's kind, it is pretty awesome on its own.

Enjoy!