Elvis Music On Glee?

Now I'm not a Gleek (actually I've never seen an episode), but I hear that Glee is a great show.  I know in the show they perform quite a few songs and it seems like every artist is trying to get their song(s) performed on the show.  It only makes sense because everyone is looking for exposure and what a great way to do it!

Now Priscilla Presley tells Entertainment Tonight that it would be a good idea to feature Elvis music on the show.  She says,

I think it would be great! Why not? Absolutely."

But then she goes on to say that an appearance from her on the show might be going a bit too far!

What artist or group or song would you like to see featured on Glee?