Timberlake and Jessie J headline at iTunes Festival

Headline acts for this year's iTunes Festival are to include Justin Timberlake, Jessie J and Queens of the Stone Age.

The free series of events will include more than 60 acts to be performed throughout September at London's Roundhouse.

Also on the bill, as the first batch of names was released today, are Primal Scream, Thirty Seconds To Mars and Jake Bugg.

Jessie J axed a tour earlier this year because she did not want to play the sell-out shows before the release of her album, which had been delayed.

Justin Timberlake, Jessie J and Queens of the Stone Age are among the headline acts the iTunes Festival. Credit: Dominic Lipinski/PA Wire

She said: "I'll be back with new music, a new look and a party you're all invited to."

Also on the bill are Phoenix and Jack Johnson, with others to be announced over the coming weeks.

Apple executive Eddy Cue said: "This year's iTunes Festival is the best ever with an incredible lineup of global superstars and stellar emerging artists. We're honoured so many renowned artists are part of this year's lineup."

Fans can apply for tickets at and the performances are also being streamed online.