If you bought iRadio, you can click on iRadio left in the sidebar (if activated) to see four new views. First is the On Air view which is similar to a radio. Second you can hear music directly from the charts. Next there is a Discover Music view which helps you to discover new music. And last but not least, there is the My Music View, which shows your offline music.
Apple has reportedly sign up all three major record labels for its iRadio music streaming service which is said to be support by audio and traditional mobile ads. It's widely expected that the company will unveil the service at its WWDC keynote on Monday.
Take a look at the video concept below or hit the link for a more detailed explanation.