Yeah, I definitely prefer the Improv piece. I think you could orchestrate it and it would be cool, but I think it works as a stand-alone piece as well. It either version would have its own distinctive awesomeness. For example I love the fully orchestrated Camille Saint-Saëns' Danse Macabre, just as much as your next guy, but I'm just as much a fan of the Horowitz reduction:
http://www.youtube.com/watch?v=a_oDYAe70SM
They emphasize different aspects of the music-experience.
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