I've been working on this song for quite a while now, and I am really glad it's finally finished. Composing Marathon and putting it together was a very fun experience, but was also very tiring.
Hope you enjoy the song in it's entirity, even though it is roughly 14 minutes long.
You may only use this piece for commercial purposes if your work is a web-based game or animation, otherwise you must make specific arrangements with the artist.