The Apalachian Dulcimer developed in North America from the European Scheitholt or the North German Hummel and is used in folk music there.
The Appalachian Dulcimer has 4 strings. The two high strings are tuned the same, the others in a fifth to the root note.
A common mood is d - a - d '- d'
The frets are set diatonic.
Like a zither lying on the table or on the player's lap, the strings can be plucked or struck. At the neck you either grab a single string or all three at the same time with your finger or a bamboo stick. The effect of playing with a bottleneck is particularly typical, so that you can quickly slide over the strings between the frets. The fifth tuning enables open play with drone notes or chords.