You should be able to find an mp3 of a Wyclef Jean version of this song on any peer to peer file sharing system (like Gnutella, for example). However, you will most likely not find the version performed on Letterman, but rather the last track off of his last album, the Ecclectic, which in my opinion, was a better version of the song anyway (better than the Letterman one, not the Pink Floyd one, obviously).

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Isn't it sad we're insane?