The term xylophone from the Greek Words ξύλον xylon, “wood” + φωνή phōnē, “sound or voice”, meaning “wooden sound”. It is a musical instrument that is consists of wooden bars that are struck by mallets. Xylophones are also constructed from materials other than wood including stone and metal. Each bar is an idiophone tuned to a pitch of a musical scale, be it pentatonic, diatonic or heptatonic in the case of many African and Asian instruments. Diatonic scale is often used on children’s instrument and chromatic for orchestral use.