its mp3!
It quite repetative. the piano is a nice touch but has a hard time blending in.
uhm... about the surround. its a STEREO file (2 way) :p you can listen to it on a 5.1 but it will not make much of a difference. cause its not encoded and probably not mixed in in a 5.1 panning system.
Try making a song out of it. Its a good start though :)
Spine therapist