This raises several questions;
1. Why would they hook it up to a real piano like that instead of a synthetizer?
2. Why are there no links, names or references to go with the video?
3. Why would you post this to podblanc?
4. Why would you post this to /prog/?
It's nowhere near as impressive as it looks at first glance (Intentionally misleading?). Guy's not actually controlling shit. If you listen to the other guy, he says that the computer composes music based on the brainwaves, not that the guy in the chair plays the piano.
Seeing how a search for 'piano brainwave' doesn't return any respectable results, I assume this is some kind of superstitious pseudoscientific bullshit like this:
http://pianoandsynth.com/2006/11/16/interview-with-dr-galina-mindlin-on-brain-wave-music-at-msnbc
Thread over.