Apple has announced the eighth annual iTunes Festival, a concert series held in London at the Roundhouse. There will be 30 days of concerts throughout September, which will be broadcast live to an iOS app, iTunes on the desktop, and Apple TV. This year’s artists include Maroon 5, Pharrell Williams, Beck, and Blondie. Apple held its first ever U.S. edition of the iTunes Festival at SXSW in March. More information is available on iTunes.