Answer:
What is that which, though black itself, enlightens the world without burning?
What force and strength cannot get through. I, with a gentle touch, can do. Many in the street would stand. Were I not a friend at hand.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What can be heard and caught but never seen?
I can only be played on a windy day