About 20 million fans have rushed to get tickets for Led Zeppelin's comeback gig, promoters said.

The legendary rock group will perform for the first time in 19 years at a tribute concert for the late founder of Atlantic Records, Ahmet Ertegun.

Fans are attempting to register for tickets at a rate of 80,000 per minute, according to service provider Pipex.

Demand has also crashed the website for London's O2 Arena, where the concert will take place on November 26.

Tickets will be allocated via a lottery and a spokesman for the gig said: "The message is to be patient. The website will be open until midday Monday September 17 for anyone wanting to register.

"It is not 'first come, first served' and all successful applicants will be entered into the ballot for tickets to be drawn at random."

Led Zeppelin will headline the tribute gig which will also feature performances from Pete Townshend, Bill Wyman, Foreigner and Paolo Nutini.

The group's three original members - singer Robert Plant, guitarist Jimmy Page and bassist John Paul Jones - will be joined by Jason Bonham, son of the late drummer John.

Led Zeppelin have sold more than 300 million albums worldwide and in 1995 the band was inducted into the Rock and Roll Hall of Fame. Ertegun, who died last year aged 83, signed them in 1968.

Fans can register at www.ahmettribute.com.

I have registered. If I win, I may have to sell my tickets at a "slight" mark up.