Listening to Dong-Da's Performance on a qin melody is a musical poetry composed by Professor Hwang Yau-tai (1912-2010). This work features a Tan Dynasty's poetry, Qin melody, piano solo, recital and four voices chorus. All the features concerns the history of ”Cai Yen's Captivity and Return” happened in the end of Han Dynasty. Through analyzing Hwang Yau-tai's work this paper will prove that the ”diaspora” as a leitmotiv could exist in the mind as well as in the works written or composed with the stories of Cai Yen's Captivity and Return. What has been addressed in this paper includes the following issues: to find a characteristic of ”diaspora” from the history of Cai Yen's Captivity and Return as well as Cai Yen's poetry named ”Bei Fen”; to trace and illuminate the meaning of diaspora; to give a theoretical elucidation to the phenomenon that the diasporal characteristic is in the mind and in the works. This paper is also expectedly seen as a practice on the study of the relationship between literature and music.