The Traditional Instrument
In the most traditional versions, various sizes of natural gourds are attached below the keys to act as resonators; in more sophisticated versions carved wooden resonators are substituted, allowing for more precise tuning of pitch. In Central America and Mexico, a hole is often carved into the bottom of each resonator and then covered with a delicate membrane taken from the intestine of a pig to add a characteristic "buzzing" or "rattling" sound known as charleo. In more contemporary-style marimbas, wood is replaced by PVC tubing. The holes in the bottoms of the tubes are covered with a thin layer of paper to produce the buzzing noise.
Traditional marimba bands are especially popular in Guatemala where they are the national symbol of culture, but are also strongly established in southern Mexico, Honduras, Nicaragua and Costa Rica, as well as among Afro-Ecuadorians and Afro-Colombians.
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