Muviz

Even if the phone has the display turned off when it’s playing music, there are occasions when the display is active. In that situation, you will need Muviz to make the listening experience a lot more interesting.
 
The Muviz app displays a music visualizer on the navigation bar, and it can do it without the user having to obtain root access to the phone. Furthermore, it’s possible to display the visualizer over videos or other active apps.
 
Of course, the app is also using different designs for the visualizations, and new ones are added on a daily basis. Furthermore, it’s also possible for users to create their own models if they don’t like the official ones.