translation.en: And so the next question was: What happens when musicians are trading back and forth, something called "trading fours," which is something they do normally in a jazz experiment?
translation.zh: 所以下面的一个问题是： 当音乐家们互相弹奏音乐时大脑是怎样活动的呢？ 有种手法叫四小节交换， 这是种在爵士乐中常用的方法吗？