Made in Acid 5, entirely with piano samples (plus a generic drum sample and some weird sci-fi techno crap at the beginning). I used about 5 or 6 samples, and pitch-shifted to get the notes I wanted. That's what gives the high/low notes that interesting distortion effect.

Total time spent on this- eh, not too much. Maybe about 6 hours? It's really not that long of a song. I ended up looping this track around twice (video game style) just to make it over 2 minutes.