It is just some fun amongst friends. There are no great mysteries about it, but now that you mention it...

These are glasses that enable the wearer to actually see music behind solid surfaces. You know how, especially dotted 16th triplets, how they like to hide behind trees. Those rascals just love to jump out and scare the hell out of people hiking in the forest, but no more. With a pair of these babies you don't have a thing to worry about, you'll see them way before they see you.