“和”是《乐论》所论的核心美学范畴.以和为美不惟是阮籍论乐的核心,也是整个正始时期的理想美学原则.它具有特定的美学内涵与外延,及历史渊源.在正始审美风尚中,它占据了主导地位.其内涵演变及原因具有可追溯性. “And” is the core aesthetics category in “music theory.” Taking harmony as beauty is not only the core of Nguyen’s theory of music, but also the ideal aesthetics principle of the whole period.It has the connotation and denotation of aesthetics and its historical origin. It occupies the leading position in the aesthetic ethics of the beginning, and the connotation evolves and the reasons are traceable.