Can it be true? Can one of the greatest rock bands in history, who have vowed to never play again live, possibly take the stage and play live one more time? One promoter says they will. "Glastonbury boss Michael Eavis has claimed that Led Zeppelin will play again one day – and when they do, they’ll headline his festival.The move seems unlikely, with the band having refused reunion offers from all directions since 2007′s Celebration Day appearance -including an approach from former US president Bill Clinton.And frontman Robert Plant appeared to have been joking when last year he hinted: “I’m not the bad guy. You need to see the Capricorns…I've got nothing to do in 2014. Plant will appear as a solo act at this year’s Glastonbury – but Eavis is determined that the singer, Jimmy Page, John Paul Jones and John Bonham’s son Jason will hit the stage together again.He tells Ireland AM: “That will happen one day. I’m sure of it. They will do it.”