man, a good improve music score! I've only seen a few that have pulled that off, but when it does, its awesome. Well, perhaps not entirely improve, but defined sets of music strung together to seem improve (I'm not sure how a TBS game could be entirely improve, but if somebody else does that would be amazing)
I've seen quite a few games that have clever transitions between music based on what is happening. that works very well. Age of Empires 3 being a good example. (I've also seen a few games that have tried that, and it didn't work so well. Demigod [beta 3B] is one of the poor examples actually, I should probebly post it but I'm unsure of how I could repeat the kinda common result of the should-be-climax music playing when its not the climax)
Ambiant sounds are a bit of a must based on the scope game is claiming. Over the shoulder games like FF7 (using an exmaple given by boogiebac, not because its a good example which it is not) actually seem a LOT better when they have even simple ambient sounds added in. Adventure games tend to do it the best, like kings quest, play Kings quest 5 or 6 with music off, but sound effects on (to ensure that the ambience stands out) then do it again with the sounds off. Then do it again with the music on. The things like the birds chirping or waves crashing just make a TON of difference.
You wouldn't need (or want) all that extra stuff zoomed out to see the entire kingdom, and especially not on the cloth map (though that could get some new ones like crackling of the fire or rustling of the pages on a book set beside the cloth map assuming that the map can actually be seen in some sort of setting of its own)
(I'd want customizable music sets so that I could remix all the MoM music and import it for old-times sake I'd have 3 sets, original (midi sound), classical (orchestrated), and techno )