Although rare, the one-string guitar is sometimes heard, particularly in Delta blues, where improvised folk instruments were popular in the 1930s and 1940s.
Eddie "One String" Jones had some regional success with a Mississippi blues musician, Lonnie Pitchford, who played a similar homemade instrument.
[1] In a more contemporary style, Little Willie Joe Duncan, the inventor of the Unitar,[2] had a considerable rhythm and blues instrumental hit in the 1950s with "Twitchy", recorded with the Rene Hall Orchestra.
The home-made unitar often has a piezoelectric sensor as a pick-up, requiring an external amplifier to be attached to produce a satisfactory sound.
[1] PVC piping is a common neck material.