I've been playing a lot of Portal 2 lately. I've always loved the game's background music as you played, and it wasn't until recently that I came up with an idea to create my own "background music" for the game.
This track also features a vocoder, and these are the words that are "sung":
You are forbidden to enter this place
Please stay away for the rest of your days
Please contact me if you would like to use this in a project. We can discuss the details.