there should be a "mp3nametable.txt" inside your data.grf or data folder whichever u have, you just have to use grf tool to extract it from your .grf (can download the tool here:
http://ratemyserver.net/index.php?page=download_tool it's the 4th one).
It looks like this inside, for example:
lhz_dun01.rsw#bgm\\92.mp3#
tells u the map name then the mp3 played...that's the closest to what you need
i wouldn't want to post mine since it might be a little outdated, if you can't extract it just ask then i'll post.