Apple’s answer to services such as Spotify and Google Music All Access, iTunes Radio let’s you listen to songs on-demand and it can also curate radio stations based on a particular song/artist/album/genre ( similar to Pandora ). It works on iPhone, iPod Touch, iPad, iTunes on Mac and PC and it’s completely free ( supported by ads ). iTunes Match subscribers will be able to use the service ad-free. iTunes Radio will be available just in the US at launch.
iTunes Radio is integrated into iOS 7 which will also drop on September 18th.