And I'm very disappointed.
It's a song called "Who Knows Who" that they did with a British rap group called The Streets. They say that they attempted to do a "British RATM" song, and the instrumental part succeeded (it's basically a more headbanging version of Heartbreaker), but the lyrics and the style are a horrible turn off.
So I think Muse themselves still have it, but this was a mistake in my mind. It would have been much better if Matt had done a distorted vocal track himself.
Anyway, here's the link, so you can decide for yourself.
http://www.youtube.com/watch?v=LBf4EuoQvyc&fmt=18
"My name's magic, and it's mud, I do bad things but I can rock."
...???
-Sean