I’ve just started using Plexamp pretty heavily the past month. I’ve grown to love it. The style of the app makes me think it would be well suited to have the option of just living in the menu bar. The entire UI could easily fit in the space a lot of apps use for their mini apps in the menu bar.
Do you have a specific OS in mind?
On macOS, Plexamp will integrate into the system media controls and should already show up in the menu bar when playing media, allowing some basic controls.
System Settings > Control Center > Control Center Modules → `Now Playing

