iOS 11.1.1 lock screen always shows iTunes controls. How do I disable this bug / feature? After upgrading my iPhone to iOS 11.1.1, the locked screen shows iTunes music prominently covering my lock-screen picture, whereas before this never happened.

I'd like to disable this feature / bug, but I don't see any mechanism for doing so.

Does everyone's iOS 11.1.1 do this, or is it just a bug that randomly hits people?

I would like to see my picture, not iTunes, which I rarely use.  I also don't want to accidentally hit "play" and start random noises from my pocket.
Rebooting the iPhone resolved this issue, and it has yet to re-appear.

This appears to be a temporary manifestation of a bug, one which I was unable to find any references to online.