One Direction will perform at the year's iTunes Festival.

The boy band - Niall Horan, Harry Styles, Liam Payne, Louis Tomlinson and Zayn Malik - will headline a show at The Roundhouse in Camden, London, on September 20 and they are thrilled to be part of the annual live music event.

Harry said: ''We're so happy to be playing at the iTunes Festival this year.

''Every year we see some of our favourite bands and artists on the bill so to be part of the line up this year is obviously incredibly exciting and we're hugely grateful for the opportunity. We can't wait to see our fans at the festival.''

'OMG' hitmaker Usher will open the festival on September 1 and said he is ''honoured'' to have been asked.

He said: ''I am thrilled to jump start the iTunes Festival in London this year. I am honoured to set the stage for what's to come.''

Jack White and Norah Jones will also perform at the event which will take place for the entire month of September.

Tickets for the iTunes Festival are free for competition winners only.

Download the free official iTunes Festival app to apply for tickets and see the line-up or go to www.itunesfestival.com.