Pretty sure you can just drop the files in the battle folder and they will be picked at random? Or do you mean something else?
Well, I actually meant that the battle music would only play when the player is only
in Cyrodiil. And when the player is back in Morrowind, the battle music there would be just vanilla.
When dropping the cyrodiil music in the battle folder implies that the cyrodiil battle tracks would also start playing in Morrowind or actually; wherever the player is atm.
Two different province music that would only play in their own province require a great amount of scripting I assume.