Disable Repeated System Alerts in iOS 7
This can't be done at the moment. There's no option to disable the alert, other than enabling cellular data.

If you're jailbroken, you can install NoAnnoyance:


   NoAnnoyance
  
  Tame iOS annoying alerts!
  
  A CydiaSubstrate tweak to disable annoying iOS 7 messages.
  
  Supported alerts:
  
  
  Cellular data is not enabled
  Disable airplane mode to access data
  Turn Off Airplane Mode or Use Wi-Fi to Access Data
  Location accuracy improved by enabling Wi-Fi
  Unsupported charging accessory
  Accessory unreliable
  Low battery
  Cellular data is turned off for "AppName" disabled
  Low disk space
  The mail server is not responding
  More...
  


If you wish for a non-jailbreak solution, you can provide feedback to Apple regarding this at the following page:


http://www.apple.com/feedback/iphone.html




Possible solution provided by Parasprite — I can't get it to work:


  After some trial and error, it seems as if it becomes permanent after a few tries.
  
  
  Turn cellular data off for the offending app ([Music]).
  Open [Music], dismiss warning.
  Close app using the app switcher (double-click home button and swipe off of screen).
  Re-open [Music], dismiss popup.
  Goto step 3, repeat until it stops showing.
  
  
  If it's behaviour is anything like The Game Center popup, it should be permanent after 3 dismissals.