Obviously several years ago.
These three Masters of the keyboard doing a little jammin' with Ron Woods, Carl Perkins backing up, directed by Paul Schaffer. Wow, I wish I had been there.
http://www.dailymotion.com/video/xe5w0_ray-charles-jerry-lee-lewis

That was really good.

Also if you don't have his latest album "Last Man Standing" You're missing a treat.