It's interesting to see how the streaming radio giants are preparing to counteract the rollout of iTunes Radio in iOS 7. Spotify finally released a web player in early June. Competitor Rdio unveiled radio stations for its iOS app today, allowing it to go toe to toe against Pandora, Spotify and iTunes Radio on iOS.
Like the other services, Rdio allows you to curate the radio stations via artist. Users can see four upcoming tracks in their radio stations and have unlimited skips, which makes sense given that the iOS app is only usable if you pay the US$9.99-a-month subscription fee. The service also has added an autoplay feature that allows you to hear similar music to artists you've recently listened to.
Radio stations have been a part of the Rdio desktop and web apps for awhile, and it hit Spotify's iOS app in June 2012.