Final preparations are continuing at venues around the world for the Live 8 series of anti-poverty concerts.
Annie Lennox rehearsed ahead of the Live 8 concert in London
U2, Pink Floyd and Madonna will play to 200,000 people in London's Hyde Park on Saturday, along with Sir Elton John, Sting, Coldplay and REM.
David Beckham, Ricky Gervais and Little Britain stars David Walliams and Matt Lucas will also appear at the event.
Other cities hosting shows include Paris, Rome, Berlin, Tokyo, Moscow, Philadelphia and Johannesburg.
More than 160 bands and artists will be performing at the 10 venues on the day.
MAP OF THE LONDON SITE
Entrances, toilets, tube stations for Hyde Park concert-goers
A further concert will take place on Wednesday as the summit begins.
The shows are timed to coincide with Wednesday's G8 summit of world leaders.
Organised by Live Aid founder Bob Geldof, they will call for more aid for Africa, debt cancellation and fairer trade.
Coldplay's Chris Martin told the BBC: "We are very proud to be part of it and we are also very proud to be part of anything Bob Geldof does."
In Philadelphia, Destiny's Child member Beyonce Knowles echoed the singer's sentiments.
"We've been a part of different charities, but this is something that is really special to us," she told the BBC.
"We're happy to help and be a part of this historical event."
In London, police have appealed for people without tickets to stay away from the event.
"They will not be able to get into the park at all and they will not be able to see or hear anything from outside," said Metropolitan Police Chief Superintendent Helen Ball.
The police will also be targeting touts who attempt to sell passes to the show.
Teams will patrol entrances to Hyde park, subways and all major routes into the area.
"The council and the police will be cracking down very heavily on illegitimate sales," said Westminster City councillor Audrey Lewis.
"This is something we have discussed with Bob Geldof, and he is as keen as we are to ensure that the only people who get into Live 8 are those who have come by their tickets legitimately."
Transport for London are asking revellers to consider leaving the concert early to avoid congestion at the end of the event.
The weather in Hyde Park is expected to be warm, with a small chance of a light shower at the start of the concert.
Tokyo's show will be the first to start, at 0600 BST. Icelandic singer Bjork, UK boy band McFly and US rock act Good Charlotte feature at the Makuhari Messe arena.
Acts including 4Peace Ensemble, Jabu Khanyile and Bayete Lindiwe will feature at Mary Fitzgerald Square, Johannesburg, from 1200 BST.
Green Day, Chris De Burgh, Roxy Music and Audioslave will play at Berlin's Brandenburg Gate, while James Brown, Dido, The Cure and Craig David are on the bill at the Palais De Versailles, Paris.
The London show starts at 1400 BST, while half an hour later will see the first acts on stage at Circus Maximus in Rome, where Zucchero, Tim McGraw, Duran Duran and Articolo 31 are due to play.
Canadian performer Bryan Adams will appear at his country's Live 8 show in Barrie, Ontario. African Guitar Summit, Deep Purple, Motley Crue and Run DMC are on the bill there.
The Pet Shop Boys lead the Moscow line-up, while Will Smith hosts the Philadelphia show, which features Stevie Wonder, Maroon 5, Kanye West, Destiny's Child and Jay-Z.
Senegalese singer Youssou N'Dour will be appearing at three venues - Hyde Park, the Eden Project, and Versailles.
Joining him at the Eden Project will be Kenya's Ayub Ogada, South Africa's Shikisha, and Thomas Mapfumo and The Blacks Unlimited from Zimbabwe.