The Yuanluo zhiyue 苑洛志樂 "Master Yuanluo's Treatise on Music" is a book on music compiled by the Ming period 明 (1368-1644) scholar Han Bangqi 韓邦奇 (1479-1555), courtesy name Han Rujie 韓汝節, style Yuanluo 苑洛. He came from Chaoyi 朝邑 (modern Dali 大荔, Shaanxi). His 20 juan "scrolls" long book begins with a 2 chapters long comment to Cai Yuanding 蔡元定's Lülü xinshu 律呂新書 from the Song period 宋 (960-1279), and from juan 3 on presents Han's own findings and research. XXX 其于律呂之原，較明人所得為密，而亦不免于好奇. Although most of the statements in his book are taken from older texts, Han's collection of sources must called a nearly complete overview of the most important aspects related to musical tuning and similar topics, from weights and measures to music instruments, dances and airs. His statements are derived the the Confucian Classics, histories, the "masters and philosophers", astronomical and geographical texts, but also from books on divination and the art of war. There is a postface writen in 1549 by Han Bangqi's discipleYang Jisheng 楊繼盛. The book is included in the imperial collectaneum Siku quanshu 四庫全書.
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.