The song used in "topography" is Yes' "The Revealing Science of God- Dance of the Dawn," from Tales from Topographic Oceans.
There's also little bits of other stuff I can't recognize, but the Yes song is apparent.
Oh, and sorry for not posting much. God. I miss Nathan, guys. >_< I miss him so much. D: And these have been very quiet nights. I need love. I hate being alone. I hate these nights. I just.. ah.