Has ANet ever commented on the possibility of releasing all the unreleased music officially?
While most of it is on SoundCloud, with the exceptions being uploaded to Youtube by the community, it would be a great service to the music and the fans to either have an official release or at least higher bitrate versions (128kbps on SoundCloud presently) available for streaming.
By comparison, while Guild Wars 1 never officially released all its music, it at least had official releases for its campaigns and high bitrate versions of the unreleased music available unofficially.