Glass or MDF Shelves

Thanks everyone @miller and @erik 
great thoughts. Yes for more a little more money I’m really liking the butcher block to have the mass and style, Thanks very much gents!!

Buy a sheet of 1/2" 9-ply Baltic Birch plywood, have it cut into shelf-side pieces. Put constrained-layer damping between pairs of the shelves, apply Minwax Clear Satin Polyurethane (beautiful!), and install. Better than anything you can buy, easy to do.

This is an interesting company.I emailed them a few days ago and they got back to me in a couple of days.They do beautiful work,and if I hadn't been so impatient I would have purchased a platform.They use plywood and veneers.https://audiophilevibrationcontrol.com 
(I ended up with walnut butcher block)