The easiest way to close Music Player, or any other running app is to do it through TASK MANAGER. The easiest way to do THAT is to create a task manager SHORTCUT on your home screen. As always, LONG PRESS on home screen and select SHORTCUTS, then APPLICATIONS, then TASK MANAGER. I use the task manager very frequently. You'll wonder how you lived...Mine also turns on spontaneosly and is frustrating. I think it turns on because of my headphones.
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