The document summarizes two Egyptian instruments and two sub-Saharan African instruments. It describes the Dombek as a goblet-shaped drum used in Middle Eastern music that produces a crisp sound. It also describes the Riq as a type of tambourine used in Arabic music that is 20-25 cm in diameter. It then discusses the DunDun, a family of West African bass drums that range in size from 25-60 cm. Finally, it describes the Mbira as a wooden board with metal keys and often a resonator.