Mastodawn

Dynamic Music Pill, the blingy GNOME Shell extension that adds now playing track info, media controls and even real-time lyrics to your desktop, has

OMG! Ubuntu

Kind of a nice app for a buck. Turns your Android into an Audio Visualizer for whatever your phone hears. Something like this, but better. https://play.google.com/store/apps/details?id=com.karlstav.cava&pcampaignid=web_share

Bar Spectrum Audio Visualizer