DESCRIPTION:
This is In C Minor And In Portal 2 It's F Minor.

Machiavellian Bach / Bach's Little Prelude 2 , BWV 934 - Piano/Keyboard Synthesia Tutorial

If You've Enjoyed/Found This Useful Please Rate/Comment/Subscribe.. The Usual, It Really Helps. :)

Midi
(Not mine)http://www.2shared.com/complete/gYjPndeZ/Machiavellian_Bach_-_Portal_2.html

"Now He's Playing Classical Music"

This is In C Minor And In Portal 2 It's F Minor, although is also how it is played by Taioo [https://www.youtube.com/watch?v=b7DBAvQL7wo]

--------------
Synthesia - http://synthesiagame.com/
Portal 2 - http://www.thinkwithportals.com/
Bach - http://www.jsbach.org/