If true, it would mark the third time that the '70s legends have played since disbanding. The band has only performed a handful of concerts, including Live Aid in 1985, since their split in 1980 following the death of drummer John Bonham. But singer Robert Plant, guitarist Jimmy Page and bassist John Paul Jones will re-group alongside Bonham's son Jason for a special concert in memory of Atlantic Records founder Ahmet Ertegun in London.

A source says, "Page, Plant and Jones spoke and agreed to do the memorial concert. They are waiting for a definite date."

"And no one can quite believe it, but during discussions about the concert they all gave the green light to a tour if it all does well and they don't all fall out."

"It has been hoped for and denied for years. But this is the closest they have ever come to a reunion tour. The feeling is that this is going to happen next year."

Ertegun died in December after seven weeks in a coma following a fall at a Rolling Stones concert. The likes of Eric Clapton, Neil Young, Stevie Nicks, and Crosby, Stills & Nash all played his New York memorial in April of this year.