The dotar (literally in Persian meaning "two strings"), and it comes from a family of long-necked lutes and can be found throughout Central Asia, the Middle East and as far as the North East of China in Xinjiang too.
In Iran, the dotar is played mainly in the north and the east of Khorasan as well as among the Turkmen of Gorgan and Gonbad. The instrument remains the same but its dimensions and the number of its ligatures vary slightly from region to region. Two types of wood are used in the fabrication of the dotar. The pear-shaped body is carved out of a single block of mulberry wood. Its neck is made of either the wood of the apricot or the walnut tree. It has two steel strings, which in the past were made of silk or animal entrails. The dotar is tuned in fourth or fifth intervals.
The kamanche is a bowed spike fiddle. The instrument has four metal strings, and the body consists of a wooden hemisphere coverred with thin sheepskin membrane. Oddly, the instrument's bridge runs diagonally across this membrane. The instrument is highly ornate and is about the size of a viola. The tuning varies depending upon the region of the country where it is being played. In Tehran, the kamanche is tuned in the same manner as a violin: G, D, A, E.
The santur is a struck zither in the form of a shallow, regular trapezoidal box. There are several sound posts inside the box, and two small rosettes on the top panel which help to amplify the sound. The santur has 72 strings, arranged in groups of four, i.e. each of four closely spaced strings are tuned to the same pitch. Each group of four strings is supported by a small,movable, wooden bridge; the bridges are positioned to give the instrument a range of three octaves
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