I wrote this WAY back in 2003 for Siggraph in San Diego to a fictitious game trailer called Kromm the Headhunter. It starts off with Gregorian chant, then explodes into full orchestra action. My chops weren't as good then, but I still was able to finish it. My sister and I sang on the track as well.
Please contact me if you would like to use this in a project. We can discuss the details.