Muviz Navbar Music Visualizer for android from Sparkine Labs

Muviz is a music visualizer app that can be added to your Android phone’s navigation bar or status bar. No root is required, so it is compatible with most Android devices. Muviz displays a visualizer of the music currently playing in your apps. 

You can also create your own music visualizer and share it with other users. Muviz provides a tool to edit existing music visualizers, as well as create your own. It can also be used with videos, to enhance the video experience.

You can edit the app to show the visualizer above the hardware navigation bar or status bar.