I have a proposal for the Zorin team.
Why not change Rhytmbox for Clementine?
I got Clementine notification Icon working right out of the gate.
And it's more versatile as well. No more ghost applicaton when Closing the app from X in the corner and no more plugin issues.
Please let me know in detail what is stoping Zorin from doing that
Clementine is built using the Qt toolkit, rather than GTK toolkit, which creates some inconsistencies.
If an end user installs and is tolerant of them, that is fine.
But for a Distro Developer, avoiding inconsistencies is the top priority.