One Direction, Pharrell and Florence + The Machine to play Apple Music Festival

One Direction, Pharrell Williams and Florence + The Machine have been announced as headline acts for this year's Apple Music Festival.

Apple announced the impressive line-up which will see fans flocking to London's Roundhouse in September.

Formerly known as the iTunes Festival, Apple renamed the event to tie-in with the launch of Apple Music.

One Direction's Niall Horan said: "It'll be great to be back in London and we can't wait to perform for our fans in the Roundhouse and around the world on Apple Music! See you there!"

American singer Williams said he was grateful to be performing at the festival.

"The Roundhouse is such a historic venue, there's always a special energy in the crowd," he said, "Thank you for having me."

The festival runs for 10 nights from September 19-28.