It's a part of Clubbed To Death by Rob D. I only know it as a remix version by some Japanese guy though. It's on the Martix soundtrack, so if you search for Clubbed To Death you probably will get some hits that refer to the Matrix soundtrack. That's the one. The rest of the track is very different than this piano part, so I don't know if you'll like that. I love it though. Epic track.
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