 The "Preface ("Lantingji Xu")" to the poems is particularly famous in regard to the art of calligraphy.Also significant is the Midnight Songs poetry also known as "Ziye" ("Tzu-yeh") songs, or "Lady Midnight" style, supposedly originating with an eponymously named fourth-century professional singer of the Eastern Jin dynasty.Included in this category of erotic poetry are both the early collection of specific pieces and pieces from the later genre which is stylistically based upon them.