This book offers a summary of the demystification of the Ngọc Lũ I drum. To decipher its meaning, I focus on a very simple, easily accessible but at the same time fundamental, structural part: The bands on the drum. The Ngọc Lũ I bronze drum is the meeting point of all the following: cosmology, religious cosmology, Vietnamese culture, prehistoric Vietnamese legends, and the Đông Sơn Circle-Rod I Ching ('Classic of Changes') (Meaning and Functions of the Bronze Drums). While doing my research I have to make do with their replicas along with even more inaccurate drawings and photographs. Consequently, my attempt to demystify the drum will undoubtedly contain some errors and minor ommissions that need further corrections or ameliorations by future researchers. Understanding the Ngọc Lũ I bronze drum will allow for an overall comprehension of the other circle-rod (yin yang) bronze drums of the Great Đông Sơn Family. The Ngọc Lũ I bronze drum in particular and the Dongson drums in general are precious treasures of humanity and national treasures of Vietnam as well. Nguyễn Xuân Quang.