samples that sing

A quick qualifier in choosing materials -
I ordered some samples last week for a project: glass block and acrylic "glass" block. I tapped the glass one with my pen and it rang out this happy note - the tone changes depending where you hit it on the block. The acrylic block makes more of a "thud" tone. A famous quote says that, "architecture is frozen music." So . . . maybe I'll tell our client that we should use glass block instead of acrylic because in a hailstorm it would sing a nicer song. It might be easier to find another excuse.