The only plans for ingame music are a media drop down list that can be accessed in-game. Of course we would need the client source for this, so it cant be done just yet. The basic idea is there would be a new folder for akarra labeled Music and you would drop your own songs in there so that you can select which ones should be playing while in game.
"Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity."