The KOEI games that Yoko Kanno worked on were not particular popular in the US and only have a cult following. However, overseas, some of those games did very well.
Sad and unfortunate, but I don't think she made a bundle with Koei but it certainly was a good footing for her career. If you look at the following link, you'll get a general outline of some projects she's been on and you'll see that her professional career seems to have begun around the time she worked for KOEI.
http://en.wikipedia.org/wiki/Yoko_Kanno
If you liked the Uncharted Waters 2 Special Edition, I also strongly urge that you listen to KOEI Game Music Works - Yoko Kanno Collection. It also consists of some of the UW2 SE tracks and some other really good pieces by Yoko Kanno. I just stumbled upon this recently and it's a real gem. The first track is actually from the original Romance of the Three Kingdoms. I could barely recognize it... definitely a masterful remake.
Jam it back in, in the dark.
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