This is the song "Sacred Icon Suite 2" from the Halo: Legends Original Soundtrack.

I did this entire song BY EAR. There are many parts to which I am doubtful, but these are mostly the chords. The sheet music, though, sounds pretty decent. There are parts in which I wanted to put dynamic markings, but the program that I used, MuseScore, would have messed it up a little (like at measure 21, the top hand should be piano, and the bottom hand should still be forte).
Nonetheless, I here is the sheet music, as well as a midi and the MuseScore (.mscz) file to "Sacred Icon Suite 2" from the Halo: Legends Original Soundtrack. Enjoy!

MR