The ngoni is a traditional West African string instrument. Its body is made of wood or calabash with dried animal skin head stretched over it. The ngoni, which can produce fast melodies, appears to be closely related to the akonting and the xalam. This is called a jeli ngoni as it is played by griots at celebrations and special occasions in traditional songs called fasas in Mandingo. Another larger type, believed to have originated among the donso is called the donso ngoni. This is still largely reserved for ceremonial purposes. The donso ngoni, or "hunter's harp," has six strings. It is often accompanies singing along with the karagnan, a serrated metal tube scraped with a metal stick. The donso ngoni was mentioned by Richard Jobson in the 1620s, describing it as the most commonly used instrument in the Gambia. He described it as an instrument with a great gourd for a belly at the bottom of a long neck with six strings.