Necroing even more, not only because this thread is one of the few results in google when looking for "colonization music", but also because it is one of the most useful ones...
Finally I discovered, after paying some attention, that the track Cornwall, one of the most memorable of the game, comes from recordings from Albert d'Ossché and Robert Force in the dulcimer (in fact, they designed their own instrument). Which would be some obscure data if there wasn't a beautiful video of Robert Force playing Cornwall in youtube, and if the recordings of both were available, all of them (which means: a compilation that says "complete recordings), in iTunes and spotify.
"Cornwall" is a beautiful tune, but listening to it being played is something different. Is something that trascends the videogame indeed.