as topic says, i have been wondering myself there are a couple of sounds tracks in that folder that are probably never been used ingame,
i have been playing this game for a while now and played almost every single country (yes even Andorra that puny country with absolutely no resources

which i even gave up on because it was impossible)
anyways back to the soundtrack thingy,
they are named like this:
generic one: (which is used while playing as israel.)
generic two: i have no idea
generic three: i think this one is played when a colony is liberated? not sure on this one
battle one: i have never heard this one ingame (i have to admit this one sounds kinda catchy

battle two: never heard this one either but i do hear its somewhat amercanish i guess but the other tone that is within it i really have no idea
when this one is played either.
so i got a question: to the goats (no pun intended) are you planning to add more soundtracks? or anything because the last two in the list are never heard ingame i guess, would be kinda awesome if there were more soundtracks added

thats just my two cents you can have both of them for doing a great job.
if there is any poor english my apologize for that.