The December 7 gig, held as part an of an MTV Exit campaign, will transform the 12th century Khmer ruins into a rock venue that will also feature US band The Click Five and a host of other international and Cambodian stars.

Lead singer Brian Molko, best known for his androgynous looks and penchant for black nail polish, told AFP he felt “honoured” to play at the historic jungle temple complex.

“It’s just one of the most breathtaking and unique places I have ever spent time in really,” the 35-year-old, who visited the ruins as a tourist three years ago, said in a telephone interview from London.

“It’s also a very spiritual and quite calming place and so to be able to perform in front of it is just ridiculous.”

But taking on the one-off gig at the crumbling ruins has presented some technical difficulties for the London-based three-piece, whose hits include Nancy Boy and Pure Morning.

“We decided that since we don’t have access to a massive wall of sound...we have been forced to deconstruct our songs, tear them to pieces and put them back together in novel and unusual ways.

“It’s very challenging and very stimulating,” he said, describing the end result as “more melody than bombast”.

Molko said he hoped the show will attract Cambodians as well as international fans and highlight the problem of this “modern form of slavery”.

Cambodia has struggled to shed its reputation as soft on human trafficking, and earlier this year suspended marriages between foreigners and Cambodians amid concerns they were being used to traffic poor, uneducated women.

The US State Department refused a visa to Cambodia’s late police chief Hok Lundy in 2006 due to allegations he was involved in trafficking prostitutes.

“There may be people (in the audience) who wish to get more involved in trying to change things. That’s all that we can do as a rock band. We are not politicians, we are not heads of police,” Molko said.

The concert is part of a series of music shows in Cambodia organised by the anti-trafficking MTV Exit campaign and the US Agency for International Development to raise awareness in young people about human trafficking in the region.

The last international recording artist to perform at Angkor Wat, which is listed as a UNESCO World Heritage Site, was tenor Jose Carreras who sang for a charity gala dinner there in 2002.

Molko said the rock concert, which is Placebo’s only outing before their sixth studio album comes out next spring, is part of a change of focus for him after becoming a father three years ago.

“When you have somebody in your life that you care about more than yourself it’s a massive shift in perspective in the way that you view the world,” Molko said.

“It does make you want to become involved in the planet that we live on. It’s the world that you are passing on to your children.”

 Cambodia says it will not "wage war" with neighbouring Thailand over their disputed border. [Reuters]

The Cambodian prime minister, Hun Sen, has reiterated that his country would not "wage war" with neighbouring Thailand over a long-running border dispute that erupted into violence last month.

He has also urged patience from both sides, as negotiators attempt to demarcate an agreed border between them.

Thai and Cambodian officials agreed in principle in a meeting last week to reduce troops at the disputed border and to form a border task force.

They plan to meet again in January.