Listening to your tunes while using your phone is a fairly common way to use your device. Unfortunately, if you want to listen to your music and see a visual representation of the audio playback, you would usually have to remain within the music app.
Usually, the visual changes based on the song’s loudness or tempo, but other factors can be used to generate a visual. Some custom ROMs support a feature called “Pulse” which is an integrated music visualization solution, but most users aren’t so lucky to have such a feature. That’s where MUVIZ comes in.