In a Rolling Stone online article that was posted today, Robert Plant stated in a recent BBC Radio 6 interview that he has unearthed some previously unreleased Led Zeppelin recordings, with John Paul Jones on lead vocals on some of the tracks. Jonesy is trying not to have them on the remastered catalog. " " So far he is going to have to give me two cars and a greenhouse not to get 'em on the album," Plant said with a hearty laugh."
"I found some quarter-inch spools recently," he said. "I had a meeting Jimmy [Page] and we baked 'em up and listened to 'em. And there's some very, very interesting bits and pieces that probably will turn up on these things."
This comes towards the end of the BBC 6 interview.