Apple is now entering the streaming music world with iTunes Radio. However, it will not be like Spotify and Rdio, but more like Pandora. It will base your “radio station” based on an artist or genre, and it will keep track of your song history to buy from Store immediately.
iTunes Radio is free with advertising – unless you are an iTunes Match subscriber. It is coming to the US, and will be available through all of Apple’s devices and PC via iTunes.