The Wuzhizhai qinpu 五知齋琴譜 "Scores for the Zither from the Five-Knows Studio" is a collection of music scores for the small zither (qin 琴) collected by the Qing period 清 (1644-1911) master Xu Qi 徐祺 and his son Xu Jun 徐俊.
Xu Qi, courtesy name Xu Dasheng 徐大生, style Gulang laoren 古瑯老人, and his son Xu Jun, courtesy name Xu Yueqian 徐越千, traveled widely around to visit the most important masters of the zither, and collected their tunes. The Qinpu was finished in 1667, but it was only printed in 1724, after several revisions. Their book is 8 juan "scrolls" long. The first two of them are an introduction into the music instrument, and the rest of the book includes the scores of 33 tunes. They commented theses tunes as "should be adopted in the original form" (ke yin可因) or "can be altered" (ke ge 可革). Its great difference to other collections of zither scores is that the compilers commented on each single tune and explained the origin of the melody and its various interpretations by zither players of the whole empire. The two masters laid stress on the continuation of the ancient traditions, but also praised those who contributed with new inventions, playing techniques and interpretations. To which school Xu Qi and his son belonged, is a matter of dispute, some scholars say belonged to the Guangling tradition 廣陵派, while the modern scholar Cha Fuxi 查阜西 says they belonged to a school of the region of Anhui and Jiangsu.
Source: Wu Zhao 吳釗 (1989). "Wuzhizhai qinpu 五知齋琴譜", in: Zhongguo da baike quanshu 中國大百科全書, Yinyue wudao 音樂•舞蹈, Beijing/Shanghai: Zhongguo da baike quanshu chubanshe, p. 691.