The service will be unveiled next month at Apple's Worldwide Developers Conference (WWDC), and will be a big step for Apple, which has largely remained behind the times since music streaming started becoming popular.
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In the new app we can see a new mini player and new playlist features that make it far easier to access iTunes Radio. It is likely that we will see Apple's new streaming offerings alongside iTunes Radio or as a part of it starting in June.
Apple's entrance into the music streaming market could have huge implications for the music industry in general. The service will directly compete with the likes of Spotify and Google Play Music, and will leverage Apple's massive user-base in order to popularize the service.
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The betas seem to be aimed at refining and zapping bugs in the service and there is a presumption that in a release update, the streaming services will be positioned within the Music app alongside local libraries and iTunes Radio, as well.