Answer:
Once you know it exists, it no longer exists. What is it?
Something you carry while singing.
I look at you, you look at me, I raise my right, you raise your left
I cannot be felt, seen or touched; Yet I can be found in everybody; My existence is always in debate; Yet there is a style of music named after me.
Old Mcdonald had this
It rows quickly with four oars but never comes out from under his own roof. What is it?
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?