I'll have to double check my working copy of the Update Notes, but I do believe combat music is coming to the PvP Halls of Pirate101.
Can the PvP combat music be uniquely different from the game's normal combat music used in it's current worlds? I would really like to hear new PvP combat music, both from the PvP halls and the upcoming world arenas, whereas Wizard101 currently uses normal combat music on arenas themed from it's current worlds.