Elbow, The Script and Lenny Kravitz have joined the line-up for the 2014 iTunes Festival.
The month-long event is being staged at the Roundhouse in Camden, north London, throughout September with entry free to ballot winners, and performances will also be beamed online to more than 100 countries.
The festival, now in its eighth year, will feature gigs by artists such as Paolo Nutini, David Gray, Gregory Porter, Jessie Ware, Rudimental and Clean Bandit among more than 60 acts on the bill.
Danny O'Donoghue, frontman of The Script, said the group are thrilled to return to the music festival on September 15, after they headlined in 2008 at Camden's Koko. Their show coincides with the release of their new album Superheroes.
"We are really excited. We did it in our first year and it's really nice that we're four albums in and playing at iTunes again," he said. "I can't wait. There's just such a great vibe. We know all the crew and the engineers so it's a fun date for us."
The Irish singer, formerly a judge on the BBC's The Voice, added: "It's the same night as our album is released in the UK, so we can't wait to play our new music and celebrate with you all."
Jenny Lewis, Charlie Simpson, First Aid Kit, Foxes and Luke Sital-Singh will also play at iTunes 2014.
"My band Fightstar played the iTunes Festival in 2009, I can't believe it's been five years. It's an honour to be invited back to play as a solo artist," said Simpson.
The latest names join the likes of Kylie Minogue, Pharrell Williams and Kasabian on the bill, alongside Robert Plant, Beck, Calvin Harris and 5 Seconds Of Summer.
Music fans from around the world can win tickets to the iTunes Festival through competitions. Further details are at www.itunes.com/festival.