On iOS 11 you don’t need an APP. The radio continues to play even with your screen off. 


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You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
On iOS 11 you don’t need an APP. The radio continues to play even with your screen off. 


pic.twitter.com/Ru96NxfLSc