Which MMO has the best soundtrack?

As the resident MMO music nut here at Massively (but not the only one, oh no), I spend probably more time than is healthy listening through soundtracks and hunting down pieces of music that ears have not heard in years.

I've got my favorites: The Guild Wars and World of Warcraft albums are a no-brainer, but I'm equally partial to Runes of Magic and Lineage II as well. If I have to pick a "best" out of the lot, my brain shuts down, I panic, and I grab the first Hello Kitty Online folder I see.

So I'll leave it up to you all: Which MMO has the best soundtrack?

TH