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kithara, stringed musical instrument, one of the two principal types of ancient Greek lyres. It had a wooden soundboard and a box-shaped body, or resonator, from which extended two hollow arms connected by a crossbar. Three, originally, but later as many as 12 strings ran from the crossbar to the lower end of the instrument, passing over a bridge on the soundboard. The strings were usually played with a plectrum, the left-hand fingers damping unwanted...