Hammered dulcimer

The hammered dulcimer (also called the hammer dulcimer) is a percussion-string 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 or 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 (μέλος, '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.

The santur, a type of hammered dulcimer, originates from the Middle East. The earliest evidence comes from Assyrian and Babylonian stone carvings dated to 669 BC, showing the instrument being played while hanging from the player's neck. This instrument was traded and travelled to different parts of the Middle East. Musicians modified the original design over the centuries, yielding a wide array of musical scales and tunings. The original santur was likely made with wood and stone and strung with goat intestines. The Babylonian santur was the ancestor of the harp, yangqin, harpsichord, qanun, cimbalom and hammered dulcimers.

In Western Europe, a hammered dulcimer first appears in textual and iconographic sources from the early 15th century. The hammered dulcimer was extensively used during the Middle Ages in England, France, Italy, Germany, the Netherlands, and Spain.

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). Each set of strings is tuned in unison and is called a course. As with a piano, the purpose of using multiple strings per course is to make the instrument louder, although as the courses are rarely in perfect unison, a chorus effect usually results like a mandolin. The strings of the hammered dulcimer are wound around tuning pins with square heads (ordinarily, 5 mm "zither pins" are used, similar to, but smaller in diameter than piano tuning pins, which come in various sizes ranging upwards from "1/0" or 7 mm), and tuning requires a wrench as for an autoharp, harp, or piano.

The strings of the hammered dulcimer are often tuned according to a circle of fifths pattern. Typically, the lowest note (often a G or D) is struck at the lower right-hand of the instrument, just to the left of the right-hand (bass) bridge. As a player strikes the courses above in sequence, they ascend following a repeating sequence of two whole steps and a half step. With this tuning, a diatonic scale is broken into two tetrachords, or groups of four notes. For example, on an instrument with D as the lowest note, the D major scale is played starting in the lower-right corner and ascending the bass bridge: D – E – F♯ – G. This is the lower tetrachord of the D major scale. At this point the player returns to the bottom of the instrument and shifts to the treble strings to the right of the treble bridge to play the higher tetrachord: A – B – C♯ – D. The player can continue up the scale on the right side of the treble bridge with E – F♯ – G – A – B, but the next note will be C, not C♯, so he or she must switch to the left side of the treble bridge (and closer to the player) to continue the D major scale. See the drawing on the left above, in which "DO" would correspond to D (see Movable do solfège).

The shift from the bass bridge to the treble bridge is required because the bass bridge's fourth string G is the start of the lower tetrachord of the G scale. The player could go on up a couple notes (G – A – B), but the next note will be a flatted seventh (C natural in this case), because this note is drawn from the G tetrachord. This D major scale with a flatted seventh is the mixolydian mode in D.