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Gagok had palyed by Nam Chang (Male Voice) and Yu Chang (Female Voice) is nowadays known singing one text for a piece of music. Gagok had many texts for a piece of music during the later Chosun dynasty but we knew the majority had not transmitted. For a piece of music, many texts came out changing melody (partly changed melody). To aim of this study is the discovery of the principle of changing melody. For it, I would revive the Gagok had missed old texts. So I inguired carefully pertinent musical items in Gagokounryu and Hyupyuldaesung. I fined out the mutual supplement relation of both in neumatic marks. But I hard to compared with those because today-using musics in Gagokbiaksun remained little. Finally I compared neumatic marks with today-using melody in Gagokbaiksun. Through neumatic marks in Gyerak, Urak and Unrak, to sum up it's following. 〈표삽입〉 Following 〈No. 18〉 I discovered the neumatic marks beside text of three musics are a little difference in the 1, 2 chapter that had ever shown. Besides I fined out the following facts. First, through the research of Rak (Gyrak, Urak, Unrak) the basic structure of Gagok is made up of three lines; The three lines are Chosudaeyop, Isudaeyop and Samsudaeyop. The Long is made up Isudaeyop & Samsudaeyop lines. The Rak is made up Chosundaeyop line. Second, The Rak is charaterized in the chodu melody, the arrangement of texts, especially the fourth chapter of Unrak and the final note.