It is possible to determine how nongak (traditional Korean music performed by farmers) was sustained and what changes happened through various records including the history of lives and experiences of nongak performers, their personal diaries, village journals, village self-governing document, village minutes, etc. Using these records, this study elucidated the continuance and changing spectrum of nongak inherited in Sopo-ri, Jindo-gun, Jeolanam-do, the factors of change in and creation of tradition by village nongak, and the phenomenon of geolgul-jinbeomnon becoming permanent in Sopo-geolgun-nongak due to its designation as an cultural asset. This study also examined the identity of geolgun in Sopo-geolgun-nongak and how this designation became permanent. The composition of percussionists in the current Sopo-geolgun-nongak, such as the Jipsa, Mudong, Jorijung, Posu, Changbu, and Nongi(Nongu), or the performances of Geolgul-jinbeomnon had ben reconstructed since the mid-1980s based on the nongak document called Seosan-daesa-jinbeop-gungo from Haenam and other similar records. This was verified in this study through the changes in organizational composition of nongak bands since the 1960s. Nongak passed down in Sopo-ri was variously called as Sopo-ri Reconstruction Youth Society Nongak, Jindo Nongak, Geolgun Nongak, and Sopo-geolgun-nongak, etc. This study focused on examining the processes of Jindo Nongak Preservation Village formation and the designation of Sopo-geolgun-nongak as an intangible cultural asset in Jeolanam-do.