The washtub bass, or gutbucket, is a stringed instrument used in American folk music that uses a metal washtub as a resonator. Although it is possible for a washtub bass to have four or more strings and tuning pegs, traditional washtub basses have a single string whose pitch is adjusted by pushing or pulling on a staff or stick to change the tension. The washtub bass was used in jug bands that were popular in some African American communities in the early 1900s. In the 1950s, British skiffle bands used a variant called a tea chest bass, and during the 1960s, US folk musicians used the washtub bass in jug band-influenced music. Variations on the basic design are found around the world, particularly in the choice of resonator. As a result, there are many different names for the instrument including the "gas-tank bass", "barrel bass", "box bass" (Trinidad), "bush bass" (Australia), "babatoni" (South Africa), "tanbou marengwen" (Haiti) "tingotalango" (Cuba), "tulòn" (Italy), "laundrophone" and others. The hallmarks of the traditional design are simplicity, very low cost and do it yourself construction, leading to its historical association with lower economic classes. These factors also make it quite common for modern-day builders to promote modifications to the basic design, such as adding a finger board, pedal, electronic pickup, drumhead, or making the staff immovable. History Ethnomusicologists trace the origins of the instrument to the 'ground bow' or 'ground harp' – a version that uses a piece of bark or an animal skin stretched over a pit as a resonator. The ang-bindi made by the Baka people of the Congo is but one example of this instrument found among tribal societies in Africa and Southeast Asia, and it lends its name to the generic term inbindi for all related instruments. Evolution of design, including the use of more portable resonators, has led to many variations, such as the dan bau (Vietnam) and gopichand (India), and more recently, the "electric one-string", which amplifies the sound using a pickup. The washtub bass is sometimes used in a jug band, often accompanied by a washboard as a percussion instrument. Jug bands, first known as "spasm bands", were popular especially among African-Americans around 1900 in New Orleans and reached a height of popularity between 1925 and 1935 in Memphis and Louisville. At about the same time, European-Americans of Appalachia were using the instrument in "old-timey" folk music. A