I didn't like some of the stock sounds so I edited and/or replaced some of them.
This sound mod shortens the length of the sounds associated with clicking in territories, such as that train blaring it's horn long and loud. It also replaces the voice overs for "Charge", "Retreat", "Hurrah" and so on with combat sounds. Battles sound like there's some fighting going on instead of some guy sitting in a can yelling charge, retreat, forward, etc.
I also tracked down that telephone ring that would occasionally happen when you clicked on an army and switched it to something more subtle.
EDIT: This is the original version. New version without loading screen music is below.
Mod attached to post: