Answer:
What instrument can make any sound and be heard but not touched or seen?
Tomorrow's yesterday. Yesterday's tomorrow. What is it?
I start in little but I end in full, you'll find me in half and complete.
What is so delicate that even mentioning it breaks it?
I occur twice in eternity. And I'm always within sight.
When is it bad luck to see a black cat?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?