Coldplay, Mumford and Sons, Russell Brand, John Stewart and Stephen Colbert are all set to perform at Amnesty International's The Secret Policeman's Ball on March 4 at Radio City Music Hall, New York. The human rights organization, who are celebrating their 50<sup>th anniversary, will be holding The Secret Policeman's Ball outside England for the first time .

According to The Sun, headliners Coldplay said they were very happy to be involved because they have been supporting the non-profit organization for a long time. The concert will be a blend of music (by Coldplay, Mumford and Sons) and stand-up comedy (by Russell Brand, John Stewart and Stephen Colbert).

"For us, it's iconic and a very special thing, and has provided the opportunity to really celebrate the presence of freedom of expression and free speech, and how we can move people and how we can bring people together, and just how powerful that is," Amnesty International spokesman, Andy Hackman told

"That phrase 'human right' has lost meaning in some ways. That's why we want to demonstrate the power and the joy that free speech can bring to us all. ... It's really just using these amazing talented people to demonstrate the power, what a force of good free speech is," he added.

Tickets sales are likely to start on Monday. A crowd of 6,000 people are expected.

Over the years many renowned musicians and artists including John Cleese, Peter Gabriel, Bob Geldof, Sting and Bono have performed at this event, first held in 1976.