Eric Clapton and Jimmy Page (Led Zeppelin ) have joined them in recording with engineer Kevin Shirley, the man behind the sound of Led Zeppelin's 21st century releases, How the West Was Won, DVD and the reissue of the soundtrack to The Song Remains The Same.

Shirley says he has been recording these guitarists and "many others." He hints toward some "high profile projects" about which he's been sworn to secrecy.

Writing from Malibu on his online diary today, Shirley spoke of a "supergroup" project. He said that come January he would be "producing what has the promise to be one of the most exciting 'supergroups' to come around in a long time" He adds, "But theory is just that until we see how the dynamics play out in the studio between these superb musicians. And of course the songs will make the real difference." - more on this story

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