The M1 tomb at Jiwanggu in Yishui,Shandong Province,dates to the middle Spring and Autumn period and is a high-ranking noble burial at the level of the ruler of the state of Ju.A total of 4 Bozhong(馎钟),9 Yongzhong(甬钟),and 9 Niuzhong(钮钟)were unearthed from this tomb,forming a typical ternary combination Bianzhong(chime bells).After systematic analysis and sound measurement,it was found that while the Bozhong displayed a relatively clear design concept for musical scales,they were poorly tuned with inaccurate pitches,rendering them of limited practical use.The Yongzhong were assembled from two groups of chime bells from different eras in a 5+4 configuration.However,their tone sequence was disordered,with overlapping notes,indicating that the assembly did not aim for harmonic completeness but rather adhered to regional conventions regarding the numerical combinations of common chime bells.Similarly,the Niuzhong were combined in a 5+2+2 arrangement from two sets of chime bells with distinct features.Upon completing the set of 9 pieces,it perfectly matched the most commonly used tone sequence“zhi-yu-gong-shang-jue-yu-shang-jue-yu”(徵-羽-宫-商-角-羽-商-角-羽)for nine-piece Niuzhong sets during this period.This suggests that the purpose of their assembly was primarily melodic,serving as the main performance component.The tomb owner's use of both the ternary combination Bianzhong and the three-sided folded chime-displaying system aligns with the funeral customs and bronze ritual vessels indicative of a feudal lord's status,thereby reflecting the strong ceremonial characteristics of funerary Bianzhong.