Dunno if this helps, as it's different from the exact one you're asking about, but it piqued my curiosity. If you go to Amazon.com and do a CD search for Dungeons & Dragons (or perhaps "and" as opposed to "&"?) there's an actual Dungeons & Dragons "official soundtrack" that comes up. I guess it's WoTC's official D&D ambiance album.
HOWEVER......
That's not the interesting part. If you then click on the links where it says "people who bought this product also bought the following items...." you'll run into 2 different artists with 3 and 6 (ish) CDs, respectively. I found these about three months ago and have since forgotten their names, but the gist of the thing seemed to be "ambiance that fits fantasy role-playing games". Again, I didn't but these or write down the artists' names, but it was enough to get me curious. It's worth a look.