diameters and tonal qualities. The set is mainly used for regular rhythms when used for accompaniment. Playing the different parts of the muyu could have different volume. Bianzhong (编钟) The bianzhong (bian, lit. collected; zhong, lit. bell) is listed as a primary metal instrument, and thus heads the metal section under the bayin classifications. Its long history dates back to the Shang dynasty (1766–1122 BC), when a set of 3 bronze bells was common, though the earlier earthenware type of the late Stone Age was unearthed in Shaanxi province. From the 5th to the 3rd century BC the number of bells increased, mostly from 9 to 13. The largest set ever recorded was exhumed from the tomb of Marquis Yi of the State of Zeng, Zeng-hou Yi (from sometime after 433 BC) in Hubei province. This archaeological finding has become a focus of international academic attention. The bianzhong being found still have a good sound quality despite many years after it was made. The bianzhong set consists of 64 bells, hung in three layers, with the upper ones called niuzhong (bells with bronze loops for vertical suspension), while those on the two lower layers were called yongzhong (bells with handles for suspension at a slight angle). Because of the shape of the bells, two different pitches, a major or minor third apart, can be produced on any of the bells, depending on the two striking locations, which are either the frontal or the lateral. 12 semitones are found in the set, with a total range of 5 octaves. The inscriptions on the bells unite to form a literary text on the large tone system of the bianzhong, valuable sources for the study of the musical culture in the Warring States period during the Eastern Zhou dynasty (475–221 BC). With the construction for two different pitches from a single bell and its unique casting methods, the bianzhong is one of the more unusual instruments of traditional Chinese music. Lion drum (狮鼓) The size of a lion drum is very big, and is widely used for the Lion dance. There are normally 2 types, the northern Lion drum (normally in red) and southern lion drum (painted in black). It is a single-headed drum, and its large size helps to create a majestic, booming resonance upon striking of the drum head. The lion drum head is made of thick, durable goat skin, and