In "Yokihi," Mizoguchi requested assistance from the Institute for Research in Humanities, Kyoto University, a top research institute on the study of the Tang Dynasty at that time, and he used scores of the Tang Dynasty in the film score with the kind help of the Gagakubu (Music Department) of the Imperial Household Ministry.
『楊貴妃』では当時の中国唐代研究の最高峰である京都大学人文科学研究所に協力を依頼したり、宮内庁雅楽部の尽力により唐代の楽譜を音楽に活用した。