iTunes festival 2013: Justin Timberlake, Jessie J and Primal Scream announced as headliners

Justin Timberlake's back in the groove with some top tunes (Getty Images)

Justin Timberlake is to headline at this year's iTunes festival in London.

The "Sexy Back" singer, who is returning to music after a seven-year hiatus, will top the bill at the free festival.

The Apple-sponsored event will feature over 60 performers at the Roundhouse, Camden throughout September.

Timblerlake is joined by other headliners Jessie J, Thirty Seconds to Mars, Primal Scream, Queens of the Stone Age and Jack Johnson.

Other performers are to be announced in the coming weeks.

Sir Paul McCartney, Amy Winehouse and Crowded House played the first iTunes Festival at London’s Institute of Contemporary Arts in 2007. Since then over 370 artists have performed in front of more than 370,000 fans and tens of millions more online and on television.

Music fans from can win tickets to the iTunes Festival through competitions run by local media partners. In the UK you can use the iiTunes Festival app and the iTunes Store as well as media partners including Channel 4, Global Radio and Metro.

"This year’s iTunes Festival is the best ever with an incredible lineup of global superstars and stellar emerging artists,” said Eddy Cue Apple executive.