MMORPG stands for Massively Multiplayer Online Role Playing Game. It's a relatively large industry, which is just going into it's second generation of games. Ultima Online, specifically, is the largest example of a 'dying' MMORPG, which is probably why it is named as such, and the fact that Occlo is easily the most underpopulated city there.
As for the original, since I've never been to Occlo, I can't really comment on this. I guess I can go grab my CD, download the program again and check out the Occlo music to see the original, but since I gave up UO a year ago, that's unlikely.
As for the actual mix.... I like it. It's nice and just about perfect BGM stuff, exactly the stuff that I look for (Most of my music is almost exclusively used as background). The guitar does create a very nostalgic effect, because a similar guitar is featured in several other UO themes. The drums aren't as nice as they could be, but I've never cared much about the percussion of mixes.
Good. 8/10. The game sucks, but oh well.
Btw, if you want to check out an MMORPG, check out Everquest, the largest, most addictive and second oldest MMORPG on the market. It's well worth the $13 a month if you have the time to play it, and since just recently it's final expansion pack was launched, you can buy Everquest Gold for only $40 and get all 4 expansion packs with it.