Drone zither
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Drone zithers or droned zithers are stringed instruments of the zither family that have few melodic strings and a greater number of drone strings. The oldest known form of drone zither is the Scheitho
Drone zither from Glogovica (central Slovenia)
Drone zithers in Europe, type "Scheitholt"
Appalachian dulcimer
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The Appalachian dulcimer is a fretted string instrument of the zither family, typically with three or four strings, originally played in the Appalachian region of the United States.
Loraine Wyman, who gathered folk songs in the field and performed them in concert halls, shown in the May 1, 1917, issue of Vogue holding an Appalachian dulcimer
Folk singer Jean Ritchie playing an Appalachian dulcimer
Courting dulcimer