What are your thoughts on these:
Triangle Mountain:
http://opengameart.org/content/triangle-mountain
https://www.youtube.com/watch?v=DZuZzA1g6CM

Pwr Chord Anthem SC:
http://opengameart.org/content/pwr-chord-anthem-sc
https://www.youtube.com/watch?v=i5dT91oLuUI
(intro takes abit)

Another Wave OS:
http://opengameart.org/content/an-other-wave-os
https://www.youtube.com/watch?v=zXCrVm1wIDE

Might they be useful to your project?
What do you think of them?
(They're libre/opensource licensed ofcourse)

Audacity source zips included along with ogg and mp3 exported.