What do you mean by four-column sound?

Yin Na is the product of the combination of ancient people and sixties. Just a melody! Classify the rise and fall of the five elements by the sound of sixty Jia Zi Na Sheng. As for the terms "fire on the head, earth in the sand, sword, front and gold", they have no practical significance, but only explain the parasitic process of the five elements. Therefore, the ancients used the Book of Changes of blind schools to discuss the fortunes of life. Also used for marriage. However, I only heard of this kind of death, but I didn't see him! Most of people's discussions on it are still on the five elements of Yi Xue.