Before theory, before notation, before anyone sat down to explain jazz — there was call and response. A phrase goes out; something answers it. That's the whole mechanism, and you already know it in your body.
You know it from gospel, where a preacher's line lands and the congregation answers back. You know it from blues, where a guitar riff echoes the vocal. You know it from work songs and field hollers, which carried this same structure across the Atlantic and into American soil. Jazz inherited all of it.
In practice, call and response shows up everywhere in the music. A trumpeter states a phrase — the saxophonist completes it, contradicts it, or teases it a beat longer than expected. Two horns trade fours: each takes four bars to say something, hands it off, and listens. Even a single improviser does this internally, throwing out a melodic idea in one breath and answering it in the next. The tension between the question and the answer is where all the drama lives.
The response is never required to agree.
What makes jazz special is that the response is never required to agree. It can affirm, but it can also argue, digress, or add a comma where you expected a period. That unpredictability is the music's wit — and once you hear it as conversation rather than performance, solos stop sounding like displays and start sounding like speech.
So the next time a band is trading phrases, resist the instinct to follow every note. Follow the logic: who spoke, who answered, and did the answer surprise you? You've been doing this your whole life. The music just gave it a name.