The tar (from ) is a long-necked, waisted lute family instrument, used by many cultures and countries including Iran, Azerbaijan, Uzbekistan, Armenia, Georgia, Tajikistan (Iranian Plateau), Turkey, and others near the Caucasus and Central Asia regions. The older and more complete name of the tār is čāhārtār or čārtār, meaning in Persian "four string", (čāhār frequently being shorted to čār). This is in accordance with a practice common in Persian-speaking areas of distinguishing lutes on the basis of the number of strings originally employed. Beside the čārtār, these include the dotār (دوتار, “two string”), setār (سه‌تار, “three string”), pančtār (پنجتار “five string”), and šaštār or šeštār (ششتار “six string”). It was revised into its current sound range in the 18th century and has since remained one of the most important musical instruments in Iran and the Caucasus, particularly in Persian and Azerbaijani traditional music, and the favoured instrument for radifs and mughams. Physical characteristics The most easily identifiable feature is the double-bowl shaped body carved from mulberry wood, with a thin membrane covering the top. The membrane is of stretched lamb-skin in the Persian tar, or the pericardium of an ox in the Caucasian tar. The fingerboard has twenty-five to twenty-eight adjustable gut frets. The Persian tar has three double courses of strings and a range of about two and one-half octaves. The Caucasian tar has 11 strings in five paired courses plus a bass drone. The long and narrow neck has a flat fingerboard running level to the membrane and ends in an elaborate pegbox with six/11 wooden tuning pegs of different dimensions, adding to the decorative effect. The strings of the Persian tar It has three courses of double "singing" strings (each pair tuned in unison: the first two courses in plain steel, the third in wound copper), that are tuned root, fifth, octave (C, G, C), plus one "flying" bass string (wound in copper and tuned to G, an octave lower than the singing middle course) that runs outside the fingerboard and passes over an extension of the nut. Every String has its own tuning peg and are tuned independently. The Persian tar used to have five strings. The sixth string was added to the tar by Darvish Khan. This string is today's fifth string of the Iranian tar. Modes of play The instrument is held high on the breast, plucked at the centre of the body