How to set a sleep timer for Music on your iPhone

Step-1 Play Music you want....                                                                                                                 

 

   

   Step-2 Go to Clock->Timer

or

Step-3 Set "Timer Ends Time" when you want to stop Music..
Step-4 After that go to the change option that is shown next to "When timer Ends" Option and                         scroll down to"Stop Playing" Option.

 Step-5 Start Timer....
         
       That's it......