Gefu is a work by Yu An-qi, a writer in Ming Dynasty, which is included in Ming Wen Hai Volume 36 and Yu Ding Fu Hui Supplement Volume 12. Song Fu describes a variety of songs, including some musicians and musical instruments.
From the early Western Zhou Dynasty to the middle of the Spring and Autumn Period, at diplomatic banquets and other occasions, the guests and hosts often express their wishes and attitudes by "writing poems". Poems that appear at the time of "Fu Shi" are called musicians to sing, and we can understand each other's positions through questions and answers. This kind of "fu poetry" is often taken out of context, regardless of the content and significance of the original work itself, and only places the views and wishes of the fu poetry writer on a few lines in the poem as metaphors or hints.