"The big system in Tang poetry is also a prosperous industry in the history of China literature." Who wrote this poem? Who is it about?

"Concentrate on all works with new Yuefu, and Lotte's works are better than Yuan's. The large-scale system in Tang poetry is also a prosperous industry in the history of China literature. In terms of works, Lotte's achievements are not only unattainable by the micro, but also imitated by the micro. "

On Yuan Juyi's New Yuefu Works: Excerpted from Chen's Notes on Poetry