My wife's Music Icon went missing on her iPhone 7plus. i followed the advice listed on many sites about resetting your Home Screen Layout but that didn't work. Since the common thought is that you can't delete certain Apple App Icons, I began to think it was an IOS problem... but, it's easier that that. On a whim, I searched in the App Store for the Music App, it was there and showed that it had been sent to the 'cloud.' Not sure how it got there but I downloaded the app from the store and her Music Icon has reappeared. Now here's the thing... if you put you iPhone screen in edit and move mode, it is possible to delete the Music App but luckily it will remain in the 'cloud' until you decide to download it again. I hope this helps.