Answer:
A tiny bead, like fragile glass, strung along a cord of grass.
Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?
I can be written, I can be spoken, I can be exposed, I can be broken.
I have a neck but no head. I have a body but no arm. I have a bottom but no leg.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?