How to display your music controls in Google Maps?
It's easy! Just start Navigation Music Controller, push your home or back button on your phone, start Google Maps (or Google Navigation, or any other app) and watch it happen. The app will become visible every time Google Maps (or Google Navigation, or any other app) is active.
You might want to show your music controls in other apps too. Navigation Music Controller allows you to do so: in the home screen, go to 'Applications' and just tick every app you want Navigation Music Controller to show up.
If Navigation Music Controller overlaps something you need, simply drag the overlay to another position on your device's screen!
To change your preferences, just start Navigation Music Controller. Every option is in the home screen. You can choose which buttons you want to appear, like 'previous track', 'next track' or 'play/pause'. You can even adjust Navigation Music Controller's transparency.
To stop using Navigation Music Controller, uncheck the 'Enable overlay' option in the home screen.