The paper presents the history of Dalmatian klapa singing in the town of Opuzen, which has not been explored in detail so far. Cultural life of the people of Opuzen is presented starting from 1939 to nowdays including two church choirs (Divojačko društvo / Maiden Society, St. Stephen's Parish Choir), The Town Music/Brass Orchestra, The Town Music Society Big Band, a number of vocal-instrumental ensambles, Opuzen Vocal Octet, but most of all it introduces nine male, female, mixed and children klapas. The interviewed narrators (Ante Juračić, Živko Ključe, Božo Popović i Mile Popović) made a great contribution to this study, shedding light on some of the events from the second half of the twentieth century , thus offering an answer to some of the research issues of this paper. The focus is on three klapa groups (male klapa Gusari s Neretve, children klapa Poletarci and male klapa Fort Opus) , which „paved the paths“ for the younger generations of Opuzen singers at the very beginnings of Klapa Singing Festival in Omiš. In fact, Gusari s Neretve Klapa won the first prize of the expert jury and the first prize of the audience at the very first of the Klapa Singing Festival in Omiš in 1967, having competed with thirteen other klapas. The laureates' succes resonated strongly in their hometown overwhelmed with pride and the following year along with Gusari s Neretve the very first Croatian children klapa named Poletarci debuted at the Festival. By composing, arranging and melographing of Dalmatian klapa songs, three academic musicians from Opuzen made an exceptional contribution to the preservation of intangible heritage - Živko Ključe, Blaženko Juračić and Ivica Kaleb. Along with the tabulated works of the afore-mentioned composers, this thesis delivers chronologically arranged appearances of Opuzen klapas in Klapa Singing Festival in Omiš as well as the melodies they performed.