Zenimax, it will be awesome if you give API/access to audio/music player to 3rd party developers. Currently there are very few available music compositions and only 1 for combat. For mmorpg with endless replayability its not a great variety. If you give developers access to music player it will allow them to trigger different clips based on triggers from your API - combat, ambient, city music, etc. Imagine playing tracks from skyrim or oblivion in ESO.
As for me, music and animations are the only weak spots of ESO.