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Not quite. Agnus Dei just refers to the lyrics, which are a liturgical prayer from the Bible. The actual music is Adagio for Strings by Samuel Barber, which was obviously originally for strings,...

I'll second Baba Yetu from Civ IV and Homeworld's version of Adagio for Strings, though I don't know if it counts since it's choral.

I'll also add this from Homeworld 2:
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It looks interesting, but that's a very unfortunate name they chose.

Both of the Homeworlds were absolutely amazing in their use of music. The songs themselves are wonderful, but what really sets them apart is how well they accentuate the narrative.

This song...

Here's a couple of my favorites:

The first is a Japanese band and like so many things Japanese, it's strange but wonderful.

http://www.youtube.com/watch?v=dgCfWKblFHE

This one is a mountain...