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I have deleted the music button/app from my phone. How do I get it back in my main settings?
You can't delete it. Look on all your screens and inside all your folders. If you still can't find it go to Settings>General>Reset>Reset Home Screen Layout. This will restore the home screen to its original configuration but may move other apps around to do so. (You may want to take some screenshots of your screens first so you can recreate your app layout.)

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