Apple has announced more headliners for its Apple Music Festival, including Carrie Underwood, Mumford & Sons and Ellie Goulding. Goulding will open the festival on Sept. 19 at London’s Roundhouse, and Underwood will become the first country star to headline at the event when she takes the stage on Sept. 21, according to NewsOK. Previously announced acts include Pharrell Williams, Florence + The Machine and One Direction. A full list of the festival’s headliners can be found here. Apple plans to make performances available for free to Apple Music and iTunes users live and on-demand, with Beats 1 and individual artists’ Connect pages providing continuing coverage of the event and access to backstage news and footage. Apple TV owners will be able to view the event in HD.

Dan Pye was a news editor at iLounge. He's been involved with technology his whole life, and started writing about it in 2009. He's written about everything from iPhone and iPad cases to Apple TV accessories.