Jordan Rudess (the current keyboardist for Dream Theater) got an epic supergroup together and recorded a cover version of Emerson, Lake & Palmer's epic "Tarkus."
I'm listening to it, and this is one of the most powerful covers I've ever heard of anything ever. Rudess' style is usually much too fast for covers, but it's just fast enough for ELP. His insane "wankery" works with the epic, turning a usually quiet and aged masterpiece into an energetic and flowing tribute to a highly underrated band.
Jordan Rudess, you da man. I think you have more potential than even Tony Banks. Good luck in the future, and I am so an undying fan.. and.. bah, not like you'd ever read this humble blog.