Maroon 5, Pharrell Williams, Beck, Sam Smith, Blondie, Kylie, David Guetta, 5 Seconds of Summer, Calvin Harris, Chrissie Hynde and many more of the world's biggest artists will be headlining this year's iTunes Festival. Apple's event will feature over 60 acts throughout September at the legendary Roundhouse. iTunes performances can be watched live or on-demand by millions of iOS users around the world on their iPhone, iPad or iPod touch and iTunes on their computer or in HD with Apple TV. Tickets are free for competition winners only.

Music fans from across the world can win tickets to the iTunes Festival through competitions run by Apple's local media partners. In the UK, fans can win tickets by entering ballots on iTunes, as well as through select media partners including Global Radio and the London Evening Standard.