The zhongruan has a mellow tone and covers the middle register in a Chinese orchestra.
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The ruan is a round-bodied plucked lute named after 阮咸, one of the Seven Sages of the Bamboo Grove, who was famous for playing it. Chinese orchestras use 小阮, 中阮 and 大阮; the 中阮 is the most common and the one most often played solo.