The yazheng (simplified: 轧筝; traditional: 軋箏; pinyin: zházhēng; also spelled zha zheng or zha cheng) is a Chinese string instrument. It is a traditional zither similar to the guzheng but bowed by scraping with a sorghum stem dusted with resin, a horsehair bow, or a piece of forsythia wood (sometimes yazheng can plucked). The musical instrument was popular in the Tang Dynasty, but is today little used except in the folk music of some parts of northern China, where it is called yaqin (simplified: 轧琴; traditional: 軋琴).