八音

八音	bā yīn	ancient classification system for musical instruments, based on the material of which the instrument is made (metal 金, stone 石, clay 土, leather 革, silk 丝, wood 木, gourd 匏, bamboo 竹) / the eight kinds of sound produced by instruments in these categories / music
八	bā	eight
音	yīn	sound / noise / note (of musical scale) / tone / news / syllable / reading (phonetic value of a character)