Since I have not been able to condense this set-up satisfactorily, I have put the tambourine back where it was several steps ago. But I have angled it more so that the jingle-jangles are more visible. (Sorry, I don't know the technical name, but you know what I mean.)
The entire set-up is now much tighter and I will probably crop a bit off the right as you see the picture. I am thinking of letting the drum bleed off the right side.
In general, I think I'll go with this. There are still some tangent lines that have to be dealt with, but I'll do that as I go along. For instance, the top of the pitcher lines up EXACTLY with the line between the black and brass areas of the gong. And the left edge of the soft drum stick lines up almost with the left edge of the blond tone block. The black part of the tambourine runs right into the black part of the gong. The two drumsticks on the sheet music could be a bit more artistically positioned.
It is a great help to me to photograph these set-ups and study them before I tackle the actual painting. I am able to see things that I probably wouldn't see otherwise.