The hammered dulcimer (also called the hammer dulcimer) is a percussion-stringed instrument which consists of strings typically stretched over a trapezoidal resonant sound board. The hammered dulcimer is set before the musician, who in more traditional styles may sit cross-legged on the floor, or in a more modern style may stand or sit at a wooden support with legs. The player holds a small spoon-shaped mallet hammer in each hand to strike the strings. The Graeco-Roman word dulcimer ("sweet song") derives from the Latin dulcis (sweet) and the Greek melos (song). The dulcimer, in which the strings are beaten with small hammers, originated from the psaltery, in which the strings are plucked.
Hammered dulcimers and other similar instruments are traditionally played in Iraq, India, Iran, Southwest Asia, China, Korea, and parts of Southeast Asia, Central Europe (Hungary, Slovenia, Romania, Slovakia, Poland, Czech Republic, Switzerland (particularly Appenzell), Austria and Bavaria), the Balkans, Eastern Europe (Ukraine and Belarus), and Scandinavia. The instrument is also played in the United Kingdom (Wales, East Anglia, Northumbria), and the United States, where its traditional use in folk music saw a revival in the late 20th century.
A dulcimer usually has two bridges, a bass bridge near the right and a treble bridge on the left side. The bass bridge holds up bass strings, which are played to the left of the bridge. The treble strings can be played on either side of the treble bridge. In the usual construction, playing them on the left side gives a note a fifth higher than playing them on the right of the bridge.
The dulcimer comes in various sizes, identified by the number of strings that cross each of the bridges. A 15/14, for example, has 15 strings crossing the treble bridge and 14 crossing the bass bridge, and can span three octaves. The strings of a hammered dulcimer are usually found in pairs, two strings for each note (though some instruments have three or four strings per note).