This is partly off-topic: I just reinstalled Dom2 to undo V2.15 to V1.14 for my MP games and thus rediscovered the beautiful music of Dom2 thanks to the default settings. Sure enough, that two songs get easily on your nerves after a few hours of play, but nevertheless I recall that my first hours learning the game with the demo where quite different and much nicer than current gameplay has become: less numbers, cute unit description texts to marvel at (I was amazed by the fountain of blood!) and that music gave it quite a unique mystic atmosphere that held me spellbound... So I decided now to order the full CD of that early music group who performed those songs, let's see if I get the early gaming of dom2 atmosphere back with that music CD...
Anyhow, I was also curious what that awe-inspiring-beautiful voice was singing, and searched the web for the lyrics. It was not too easy to find a translation too, so here is the link that I've eventually found:
Cantiga de Santa Maria No. 7, it has the original lyrics in Old Gallician/Portuguese as well as an english translation.
Spoiler warning: You might not like what you find, for the pious lyrics seem to be intended rather funny than mystic-awe-striking...
I guess it's similar to Dom2: You wanna know more and more and to learn the mechanics of every tiny bit until you realize that the price for that knowledge is the loss of atmosphere...