CIRCA was formed in 2007 by veteran YES members, Alan White, Tony Kaye, Billy Sherwood and Jimmy Haun. I had the privilege of seeing them perform this medley live for the first time. Billy had tried to convince the members of YES to do this while he was still a member of YES but they declined. Now CIRCA does it.
http://www.youtube.com/circahq
Here is CIRCA today. Alan White has moved on and percussions are covered by Jay Schellen.
http://www.myspace.com/circahq