I was in a retail store the other day and they had some 2'x4' rectangles of welded wire mesh (mesh size about 2" square) hung from the ceiling w/ "J" hooks. The mesh looked like wire shelving.
I thought that might be a good way to hang compressed 'glass panels. It would be rigid, so no sag, open to let sound through, easy to do, and cheap.
Sorry if someone's mentioned this before. I'd only seen post about frames and pegboard.