Google "Play Music" app constantly running! Why is Google Play Music constantly running on my galaxy s4? I don't use any music app.
If you don't use any music app (especially not the one in question), there's an easy cure:


Go to Settings&rarr;Apps&rarr;Manage Apps
Go to the All tab
Scroll the list until you find Google Play Music
Tap the entry
On the screen which opens on the tap, you'll find a button labeled Disable -- push it.


If the Disable button is grayed out (and cannot be pushed), you might need to first Force Stop the app, and Uninstall updates. If you later decide you want to use the app, and enable it again, updates will be applied once more -- so no worries for that.

Done: You've successfully disabled the Google Play Music app. It will no longer be available in your apps drawer, and should no longer run automatically either. Works fine for me, also for Google Play Books and Movies. Another nice side-effect: Your device will no longer bother you for any updates of those (disabled) apps -- which might even help you saving your data plan for better things :)