Those were probably made by the same people, possibly when they were still Falsobordone. Try to find list of songs on various CDs and listen through the Falsobordone samples.
http://www.falsobordone.com/engindex.htm
The video files have vanished, unfortunately. Three of the four songs still available there I've heard before in Dominions, and I'm pretty sure it was Dominions 3. I did play DomII as well, so some might only have appeared in there.
Searching for "Cantigas de Santa Maria", I found this:
http://uk.youtube.com/watch?v=6NU5DxRauAs
Attending a renessaince faire and having that music in the background... That'd be awesome, and somewhat scary.
Falsobordone links are mostly outdated, though, so I don't know if you can find much more.
Re: Listening to Dominion\'s music files...
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