The lineup for Apple's 2013 iTunes Festival is now almost complete ahead of the September 1 opening night, with the addition of four more top drawer artists to the bill. Tinie Tempah, Avicii, The Lumineers and Bastille are the latest acts signed up to perform at the free, month long festival at London's Camden Roundhouse.

Avicii will take the stage on September 13, Bastille on September 8, The Lumineers on September 3 and Tinie Tempah on September 26. UK music fans can apply to win tickets now from the iTunes Festival app for iPhone and iPad, or via iTunes on their Mac or PC. Those not lucky enough to attend in person will be able to watch the whole thing live on their iOS device, via iTunes or on the Apple TV. Anyone sticking their name in the hat for any of these?

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