I haven't actually played Portal 2 yet, but the first one made me kind of dizzy with all of the switching of direction and such, but definitely an addictive game!

Download the entire Portal 2 soundtrack at this link:

http://www.thinkwithportals.com/music.php



Some of the songs are a little too intense, but some are good mindless tunes if you're doing some mindless work

Enjoy!