In ancient times, the sounds made by musical instruments were categorized into "Five Notes" which includes Gong, Shang, Jue, Zhi and Yu. The eight main materials used to make musical instruments of different sounds were gourd, clay, leather, wood, stone, metal, silk and bamboo, and together they were called "Eight Sounds". The "Ping" (flat), "Shang"(rising), "Qu" (falling) and "Ru"(entering) tones were the four tones of classical Chinese phonetics (different from the tones used today). Only when the four tones are used in harmony can one speak the language properly.
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