This is not nearly as complex as it sounds. It is difficult because it is driving and relentless, requires very strong arms. I wrote it a few days ago when I was aching a lot, to distract me, and perhaps relieve the aches. Well, the aches are still present, a permanent fixture, I guess. But the music is finished. The difficulty for me was creating a good score layout.
The mp3 was made using Sonar, Fatar Keyboard, and GPO Steinway.