The ”Yueh” put forth here is the multifarious ”Yueh” found in ancient Chinese civilization. This article also contains the views of various scholars of Chinese aesthetics since Li Ze Hou. The views are that the origins of ”Yueh” are closely connected with mythology and witchcraft, being considered latent in the former. Thus, there arises a question of ”The Composer's Mystical Nature”. From the formation of myth, the words and the musical instrument, we can proceed to discuss the ancient meaning of ”Yueh”. We can also make known the full mystical connection between ”Yueh” and the composer.