Pharrell Williams, Maroon 5 and Kasabian are among the first acts to be announced for this year's iTunes Festival.

The concerts will take place during the month of September at London's Roundhouse and will also feature Beck, Robert Plant, Blondie, Calvin Harris, Sam Smith, David Guetta and Five Seconds of Summer.

More names are expected to be added to the list over the coming weeks.

Speaking about their performance on September 5, Kasabian said: ''We're very proud to be in this year's iTunes Festival line-up, and we are excited to be playing alongside so many great artists. We have had a huge year so far. Expect some surprises!''

And Robert Plant, who will take to the stage on September 8, excitedly added: ''We've been roaring around the world this summer from Morocco to the Arctic Circle. The band is on fire. It's now time to shake it on down in NW1.''

This is the eighth year of the festival, which will take place over 30 nights in London.

Apple's senior vice preside of internet software and services Eddy Cue said: ''The iTunes Festival in London is back with another stunning line-up of world class performers and tremendous new acts.

''These live shows capture the heart and soul of iTunes and we love bringing them to our customers in the Roundhouse, as well as to the millions of people watching all over the world for free.''

Tickets are free to competition winners and the gigs can also be watched live or on-demand via iTunes or Apple TV.

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iTunes Festival 2014 line-up so far:

September 2: Beck

September 3: David Guetta

September 4: 5 Seconds of Summer

September 5: Kasabian

September 7: Calvin Harris and Kiesza

September 8: Robert Plant

September 9: Sam Smith

September 10: Pharrell Williams and Jungle

September 1: Maroon 5

September 16: Blondie and Chrissie Hynde

September 27: Kylie Minogue