Summer, 1981  Chris and Alan White jam with Led Zeppelin guitarist Jimmy Page, in a project tentatively called XYZ. No official recordings are released and the project fizzles out.Bootleg called "After The Crash"  - XYZ Sessions, with Chris Squire and Alan White  1982.

What can you tell me about the sessions that resulted in it?

CS: There was a period when Trevor Horn and Geoff Downes had been in Yes in the 80s. We had done the Drama album and toured America on that, and that's also when John Bonham died around the summer of '80. So, after we got back from touring, Jimmy [Page] moved and bought a house in England near the house I was living in. So, we became neighbors and got together. He was obviously pretty depressed about John Bonham's death for awhile, and I kind of helped him out of that by saying "Let's try to do some new music" and that's really what happened.

Here's more of  interview with Alan White and Chris Squire:- 

http://www.led-zeppelin.org/reference/index.php?m=int34


Ollie

Here's another interesting interview with Chris Squire where the 'XYZ' project is mentioned.

http://www.innerviews.org/inner/yes.html