Answer:
It's equally comfortable in an orchestra and a geometry textbook. What is it?
At the sound of me, one may dream or stamp their feet, At the sound of me, one may laugh or sometimes weep.
Two brothers we are, great burdens we bear. All day we are bitterly pressed. Yet this I will say, we are full all the day, and empty when go to rest.
You will find me with four legs, but no hair. People ride me for hours, but I don't go anywhere without needing to be tugged. Jerked or turned on, I always manage to be ready for work.
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
The strangest creature you'll ever find: Two eyes in front and many many more behind.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?