Wassoulou is a genre of West African popular music, named after the region of Wassoulou. It is performed mostly by women, using lyrics that address women's issues regarding childbearing, fertility and polygamy. Instrumentation includes soku (a traditional fiddle sometimes replaced with modern imported instruments), djembe drum, kamalen n'goni (a six-stringed harp), karinyan (metal tube percussion) and bolon (a four-stringed harp). The vocals are typically passionate, emphatic and in a call-and-response format. Prominent artists include Oumou Sangaré, Coumba Sidibe, Dienaba Diakite, Kagbe Sidibe, Sali Sidibe, and Fatoumata Diawara. Several of these prominent artists perform on an album called The Wassoulou Sound: Women of Mali.