The iTunes Festival 2013 is almost over, but three legendary acts are still set to take the stage.

On Sept. 28, John Legend will take the stage during Apple's iTunes Festival at the Roundhouse arts center in London. Legend worked behind the scenes with the likes of Jay-Z, Kanye, Nas, Mary J Blige, Alicia Keys and even Michael Jackson, but he's now most famous as a neo-soul crooner in his own right. He's back with a new album, Love in the Future, which will get its first London airing at the iTunes Festival.

Without going across the pond, fans can watch the concert online for free through live streaming video.

Watch the iTunes Festival Live Stream. 

Then, on Sept. 29, Justin Timberlake will take the stage, with Katy Perry closing out the festival on Sept. 30. 

Each headlining act is scheduled to perform at 9:00 p.m. London time, which translates to 4/3c.

The festival kicked off on Sept. 1 with Lady Gaga. This month huge music stars like Elton John, The Pixies, Kings of Leon, Queens of the Stone Age and Robin Thicke took the stage.

You can watch on your computer at the iTunes store, Apple TV users can watch in HD from the main page or you can download the iTunes Festival app to your phone or iPad.

If you miss it, many acts can be viewed for a limited time after the concert, and of course, iTunes will be selling some of the performances at the iTunes store.

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