Acts will play London's Roundhouse venue this summer
As previously reported, Scissor Sisters, Ozzy Osbourne and Tony Bennett have already been confirmed to appear, with more acts set to be announced soon.
Tickets for the shows will be free to competition winners – see iTunesfestival.co.uk for details.
The line-up, so far, for this year’s iTunes Festival is:
Scissor Sisters (July 1)
Tony Bennett (2)
Ozzy Osbourne (3)
Ellie Goulding (8)
The xx (12)