Kalumbu
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The kalumbu, or kalumbo, is a single metal-stringed bow that is played with a stick. A calabash gourd that is lashed onto the convex side of the bow acts as a resonating chamber. The kalumbu player manipulates the resonance of the instrument by moving the gourd to and from his or her chest. Though now quite rare in Africa, the kalumbu is considered to be the predecessor of the Afro-Brazilian berimbau, which can be heard in Capoeira performances.