It would be more immersive if music was changed in the Pre-Battle overview, multiplayer lobby tracks fit quite nicely since they aren't very calm nor very action-packed,
Once negotiations end in a fight, and game goes back to campaign map, current music should stop and be replaced by some music that adds some sort of tension.
Once negotiations end in a fight, and game goes back to campaign map, current music should stop and be replaced by some music that adds some sort of tension.