How it checks
every 5 seconds, and only players that are already running; it never opens one.

About
What’s playing in Music or Spotify, in the menu bar. Click it to play or pause; right-click for the panel with the track, Previous, Next and volume.
Inside
every 5 seconds, and only players that are already running; it never opens one.
which player to follow (whichever is playing, Music or Spotify) and what the menu bar shows (title and artist, title, or just the icon).
Play or Pause Music, Next Track, Previous Track, Copy Current Track.
now_playing describes the current track.
Install
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stackbarctl install --index https://navbytes.github.io/stackbar-plugins/index.json io.navbytes.stackbar.plugins.music