Radiohead - Down Is the New Up
(version with Thom Yorke himself on the piano, i've only got this from youtube actually, as i don't know the cd it's on. maybe on the second cd of In Rainbows? pay attention to the rhythm of the piano, reminds me of The Pyramid Song)
--- a small update (approximately 40 minutes later, for he/she who cares) ---
apparently on youtube different versions can be found. i usually don't post links here, but now i would like to make an exception (and maybe i should do this more often?). should you want to listen, make sure it's this version: http://www.youtube.com/watch?v=tQ9le9DMd4Q
...and if not: have fun!