Here's a pianist performing a piece by Steve Reich. What's interesting is, like a lot of Reich's work, the piece involves producing a phasing effect by having one part slightly speed or slow from the other. It's extremely demanding on performers, to be able to manage and maintain the micro tempo changes that the scores call for. So this guy has learned to do it by himself, left and right hand, on two pianos. Pretty awesome.
Video
here. Audio (the whole 20 minute performance)
here.
* Sorry about that typo in the title. I hate that.
