It's been a while since we heard any news about Music of the Spheres, but the wait just got a little easier: Bungie.net now has an archive of all the Destiny music released thus far. The three pieces available now are "Eighth", "Law of the Jungle", and "Awakenings". Go listen!
EDIT: Silence fills this empty post, now that page is gone. But my mind is not at rest, for questions linger on...