The Caribbean coastal region of Colombia is called the costa, and its inhabitants are referred to as costeños. The müsica costeña (coastal music) is a product of tri-ethnic syncretic cultural traditions including Amerindian, Spanish, and African elements, a merging that begins with the colonial period and continues into the republican period on the Caribbean Coast. Traditional music from the Colombian Caribbean coast expresses its tri-ethnic costeño identity in various vocal styles and musical forms and through its types of instruments and the way they are played. This essay describes the aspects and circumstances under which cumbia, a coastal musical genre and dance form of peasant origins characterized by an African-derived style, has spread from its local origins in the valley of the Magdalena River to acquire a Colombian national identity, becoming in a few years a transnational musical phenomenon.