If you listened closely, you may already know that Brooklyn band The National recorded a song "Exile Vilify" for Portal 2. And now Valve is holding a music video contest for it. Win and get swag from Valve and the band [http://www.ThinkWithPortals.com]
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This sounds like a song that's been around for five years already. It is a FANTASTIC SONG, but I could have sworn I've heard it before... Weird feeling!