Was listening to my iPod when I heard a few keyboard friendly songs that I think would probably work, though I know there's just no way in hell Harmonix would consider them.  No, this is not a wishlist...just thinking a little outside the box.
  
It's Time To Party by Andrew W.K. - Good fast, stupid, party song.  Only 1:30, though. 

i dont know why they dont include all shitty music into roc band. 

there are songs shorter than It's Time to Party... the real problem is that IT'S A SONG ABOUT MASTURBATING AND EJACULATING ONTO SOMEONE'S FACE. Party Party Party seems like a better candidate, with the guitar solo and all. 
 
edit: party party party is the same insane party party party song that @marioncobretti was talking about. it's amazing

Probably for the best.
 
And I love the Cardigans, but they have far better, and more appropriate songs for RB. Such as:
 
 

Favourite Game is a great song.  I remember they used it in the Gran Tourismo 2 intro i think it was. Pretty rad. 
And she's HOT. 
 
I can do without the other songs in this thread i think. I need more Queens songs. An i know it'll never happen cause Page is so dicey about licensing stuff an i've heard he doesn't like music games but goddamn i'd love some Zeppelin.

I'd like to see The Stranglers' No More Heroes for the keyboard part.