Mmm. That orchestral piece was loosing me, then it stuck the landing. Read into that what you will. Did the first have that kind of a soundtrack? That's some good stuff.
Actually, all of the above music is from the first game's soundtrack. The super-mellow thing it begins with seems to be a heavily tuned version of Discovery of Gravitation (which opens the game), and it ends off at Gravity Daze, the game's theme song.