The Huangyou xin yue tuji 皇祐新樂圖記 "New Illustrated Record on Music from the Huangyou Reign"
is a treatise on music written on imperial order by the Song period 宋 (960-1279) scholars Ruan Yi 阮逸 and Hu Yuan 胡瑗. Ruan Yi, courtesy name Ruan Tianyin 阮天隱, came from Jianyang 建陽 (modern Jianyang, Fujian), and Hu Yuan, courtesy name Hu Yizhi 胡翼之, from Hailing海陵 (modern Taizhou 泰州, Jiangsu). In 1036, during XXX the Huangyou reign 皇祐 (1049-1053) the XXX emperor ordered them to compile an official text on the practice of ritual court music. The 3 juan "scrolls" long book was finished in 1053 and presented to the throne. The book was rediscovered during the Ming period 明 (1368-1644) in the imperial library of the Wenyuan Hall 文淵閣. This version had a preface written by the bibliographer Chen Zhensun 陳振孫, author of the Zhizhai shulu jieti 直齋書錄解題. A later preface was written in 1329 by Wu Shoumin 吳壽民, and a third one in 1601 by Zhao Kaimei 趙開美.
The book is very important for concrete details on the measurement of the basic Yellow Bell pitch pipe 黃鐘 that has a XXX 積八百一十分 and a volume of 1200 millet seeds (shu 黍). Another calculation according to the mathematical book Jiuzhang suanshu 九章算術 says that the XXX 黃鐘每管長一分，積九分，容十三又三分之一黍, and the diameter of the bore of the pipe was 3.46 fen, and the circumference 10.38 fen. While the method with the millet seeds is quite correct, there is an error in the circumference method. There is also a contradiction between the length of the foot (chi 尺) calculated with large millet seeds (dashu 大黍) and that calculated as based on smaller millet seeds (xiaoshu 小黍). The first part of the book describes methods to calculate the length of pitchpipes (lülü 律呂), of length measures (chi) with the help of millet seeds (shu 黍橫黍), the "four volume measures" (si liang 四量) and weights (quanheng 權衡). The second and third part of the book explains the tuning and arrangement of sets of bells (zhong 鐘) and soundstones (qing 磬), Jin drums (jingu 晉鼓), XXX (sanshengding 三牲鼎) and XXX luandao 鸞刀.
The Huangyou xin yue tuji is included in the collectanea Siku quanshu 四庫全書, Xuejin taoyuan 學津討原 and Congshu jicheng chubian 叢書集成初編.
Source: Li Xueqin 李學勤, Lü Wenyu 呂文鬰 (1996). Siku da cidian 四庫大辭典, Changchun: Jilin daxue chubanshe, vol. 1, p. 622.