Answer:
It's equally comfortable in an orchestra and a geometry textbook. What is it?
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. The wind is my lover, one-legged am I. Name me and see me at home in the sky.
There are several different kinds, but the one you pick doesn't do its job. What is it?
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?