ringbearer: I created a second account account to use for the US store. You have to pay to use the streaming service, so I just used it to download the albums I wanted and transferred them to my phone.
But how did you log out of the windows 8 music app, to log back in under another account. I looked everywhere and can't find anyway to log out. It seems to be linked to the main windows login. I could create an entire new user in windows, but that is quite a bit of effort just to log into music under another user.