The songs are split so that at the end of the battle the current song switches to this fade-out track. This way the song just doesn't end aprupt or fades out on itself but gets a proper ending. So the _finale tracks play shortly after the battle has ended. So replacing it wouldn't make much sense since the battle is already over. I'm currently trying to get more control over the songs with the creation kit (which should be possible according to the wiki, for example: http://www.creationkit.com/Music_Track). But I really don't know how I should go about this since I only wan't to replace certain songs and set their fade-out time for example. If anyone has more info on this it would be appreciated. I also have a similiar problem like this (http://forums.nexusmods.com/index.php?/topic/543892-music-replacement-issues-sounds-bsa-directory-structure/page__p__4423056__hl__music__fromsearch__1#entry4423056) where not all my replaced music plays...
