So I've seen a number of people, here and in game, that say they hate the campaign battle music, mainly because it interrupted the good zone music from WotG.
I wrote this addon to prevent the music from playing, both when you first zone in, and if a campaign battle starts whilst in a zone.
https://github.com/xurion/ffxi-no-campaign-music
Simply stick the ncm.lua file into a new ncm directory in the addons directory, then load it with //lua load ncm.
And may your crystal war ears be happier for it.