I found these here on Cape Cod. I love how they each have one white leg…same pose different instrument!

What Allee has to say about this:
I love wall plaques like this. It was a big 1950’s thing to insert figural art on top of diamond shaped wood or fake wood cutouts. Harlequins, of course, are also a staple of the ’50s, as was that color palette.

I would actually mount these differently and switch who was on the right and who was on the left so they faced each other as they played their instruments.