What! I've been playing without knowing this... do you have any details? Any way to fix it?
Pretty much what Minsc said. I've never played the retail version so I didn't even notice it when playing the game, I just did occasionally think "Wow, they didn't include a lot of overworld music in this game."
And you spend a LOT of time in the overworld. It's not like Diablo where 90% of your time is in dungeons.
There's no fix to my knowledge, although I guess it doesn't effect everyone. I would seek out a retail copy, but supposedly that is unstable at higher and widescreen resolutions which is way more important to me.