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Music often teaches us fun things. One person knocks tac tata tac tac, the other answers tac tac. Why?
Believe it or not, the answer may lie in a common drum (percussion) pattern that I want to share:
Clave (clah-vay)
The sticks are called claves, and the musical phrase is called clave!

There is a "2 side" and a "3 side."
The daa dada daa daa has the 3 side in it, the answer is the 2 side!
Good music often has a statement, or melody, or phrase, then complimentary or secondary statements, in conversation. In this post I wanted to "call" or "make a statement," and if it was "responce'd" or "complimented" well, then I would continue my melody, harmonizing, well, continue my topic. Waiting for someone to answer "daa daa" was fun!
Would you like me to tell you more about clave patterns?