This is a question about holiday decorations, or beyond? If the former, then I guess you need a poinsetta right in the middle up there.

Hang that wreath on the wall above the piano. Put a song book of Christmas songs on the book holder. Place the tuba on the right side of the piano (it seems to be leaning against the door casing now). Then post a pic for more suggestions.

In order for your decorative items to "shine", they each need a little more space. If items are too crowded, then nothing gets the individual attention it deserves. I would recommend hanging the wreath above the centre of the piano and putting only one item on either side.

Good point What's inside. A bit crowded now and nothing is the "star" of the piano.

Thanks Darzy! :) Here's a quick visual showing what I am thinking of:

What you need over the spinet, year ‘round is a shelf. Then you can design for the seasons.

I'd be terrified the French horn would get knocked off and get a huge dent. (Paranoid former French horn player here).

Framed sheet music looks great in all seasons