Portal 2 Easter Egg - Hidden Song on Radio - Exile Vilify

Go to Chapter 2, Chamber 3. When you enter, go to the door and turn right. There is a Ratman den. Also, make sure you shoot a portal somewhere in the chamber for you to escape later. When you drop into the den, go to the left and there is a corner with a radio. The radio plays "Exile Vilify" by The National. You can take it anywhere in the chamber, but GladOs will destroy it if you go through the Emancipation Grid (awwwww). This track is on the Portal 2 Soundtrack, but many people got confused where it came from.