An app to stop another app (Music Player) after some time A friend of mine asked this question "Do you know of any timer apps for iPhone which will close down a particular app after a set period of time?"

On questioning further - the "particular" app happened to be Music Player.
Launch Clock
Choose Timer
Tap on When Timer Ends
Scroll right to the bottom and pick Stop Playing
Set your time - say, 20 minutes (or whatever time you want) and tap on Start


Hope this helps.