I've been trying to find the original source of this tune for years:
http://www.aerobushentertainment.com/index.php?cat=music&id=3
The mp3 is my best attempt at replaying the core of the original tune. The YouTube video is very close, but I'm pretty sure the original tune I heard was simpler and I know I heard it at least around 2004 or earlier. Maybe in a video game, anime, or anime music video. Any help would be much appreciated! It's very beautiful, and has been haunting me for a long time.