what is that chinese guitar?
The sanxian is most popular in the north. Ruan ()- commonly referred to as Chinese guitar, is an ancient four-stringed moon-shaped lute with long and straight neck and various number of frets, dated back at least to Qin Daynasty (around 200 BC). Ruan is used to be called p'i-p'a (pipa) or qin-pipa.