would it, by chance, be possible to get some more music from the game? The menu music for some missions is just awesome, so i was wondering if GOG wouldn't mind releasing it, or if there's another way to get them.

There's more music that they don't have in the extra package GOG already offers?

The music files are in warble_fs2.vp. You'll need a program capable of opening .vp files. VPView is a good choice, since it will only allow you to open .vp files and extract their contents. You can't break anything with it. http://www.descent-network.com/cgi-bin/descman.cgi?module=vpview