Apple's annual iTunes Festival has begun in London -- 30 days of free concents by top artists such as Usher, Jack White, Muse, and Alicia Keys. If you're not in London to attend the festival at the Roundhouse, you can watch all of the events via live streaming, or watch recordings after the concerts have taken place. Apple is making the shows available via streaminig to your desktop computer, to Apple TV, and via a free iTunes Festival app for the iPhone, iPad, and iPod touch.
The iTunes Festival website has a schedule of the full lineup of performers. You can also sign up for their email list to receive announcements and notifications of upcoming events. To watch live or to see the recordings, the iTunes Festival website redirects you to the iTunes Festival area in iTunes. I watched a bit of the performance by Usher -- and it looks like a pretty awesome production.