Washtub bass
The washtub bass is a folk instrument 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, most washtub basses have a single string whose tone is adjusted by manipulating the neck and finger board to change the tension.The washtub bass is sometimes part of a jug band, often accompanied by a washboard as a percussion instrument.
In English skiffle bands, the same sort of bass has a tea-chest as a resonator.
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