Jennifer Lopez, Chaka Khan and Alessandro Safina will perform live at an extravagant gala ceremony in Lisbon, Portugal, on July 7 to mark the final selection of the new Seven Wonders of the World.

The two-hour event, at the city's Estadio da Luz stadium, has sold out its allocation of 40,000 tickets, with prices ranging rom €55 ($75) to €110 ($150).

One expected highlight will be its dedicated anthem, a song called "New 7 Wonders of the World," which druid-influenced British folk rock band The Dolmen will perform live.

The song, released on March 23, is currently available only in the download format and sold via online stores such as iTunes, Napster, Yahoo! Music, and the event's new7wonders.com Web site.

Also performing will be Portugal's Fado, singers Mariza and Dulce Pontes.

"From the very outset, the emphasis for the New Seven Wonders of the World was to make this a truly musical event because we quickly realized that music as a cultural dialog is the one thing that unites people across the entire globe," says Tia. B. Viering, New Seven Wonders spokesperson.

The campaign to choose the new Seven Wonders of the World began in 1999. The brainchild of Canadian-Swiss entrepreneur and adventurer Bernard Weber, the objective is to revise the original Seven Wonders for the 21st century.

The ancient "wonders" included the long-vanished Hanging Gardens of Babylon, the Statue of Zeus at Greece's Olympia, and the Great Pyramids at Giza.

Contenders for the seven modern-day versions will be chosen from a shortlist of 21. They include the Sydney Opera House, the Statue of Liberty, the Eiffel Tower, the statue of Christ the Redeemer in Rio de Janeiro, the Great Wall of China, and Stonehenge in the United Kingdom.

The Great Pyramids at Giza were automatically put forward to the final list because the Egyptian government said it was an insult that they should even have to be considered.

Portuguese commercial TV network TVI is the host broadcaster, and overseas broadcasters will be able to pick up the satellite signals to air the show locally. A live-streaming broadcast will be accessible via the www.new7wonders.com Web site.

The event is organized by Switzerland-based New Open World Corporation with Portuguese agency Realizar Impact Marketing, which is recognized for its innovative, international multimedia productions.

The winners, which will be announced at the ceremony, will be chosen through what is believed to be the largest online and telephone vote in the world.

Profits from ticket sales, tele-voting and individual donations are to be invested in a fund to help restore and preserve some of the world's leading cultural and historical monuments.

International stars, such as Oscar-winning actors Hilary Swank and Ben Kingsley, Portuguese soccer star Cristiano Ronaldo, and astronaut Neil Armstrong will be flown in to present the winning awards.