Ji Kang
Ji Kang's polymathic interests ranged from "xian" "transcendence; immortality" techniques to music theory. His essay "Yangsheng lun" "On Nourishing Life" contends that one can achieve longevity through Daoist breathing exercises, diets (e.g., "bigu"), and drugs (Cold-Food Powder). Drug use was widespread among the literati in early medieval China, and Ji Kang was "reputed to have been a connoisseur in this field". Ji's writings on music include the famous "Qin fu" "A Rhapsody on the Qin" zither, "Shengwu aile lun" "Essay on the Absence of Sorrow or Joy in Music", and a number of solo pieces for "qin".