During South Korea's authoritarian period (1961–87), student activists employed songs to express their anti-government and pro-democratic views. Known as minjung kayo (people's songs), these protest songs can be traced to the modern American folk music embraced by South Korean youth in the 1960s. By the late 1980s, however, minjung kayo carried emphatically anti-American, nationalistic, and socialist tones, echoing the minjung ideals that strove to achieve authentic ‘Koreanness’. This article unravels the complexities underlying the process of minjung kayo's development into an emblem of the pro-democratic movement, which entailed a shift away from its initial reflective and poetic style inspired by American folk music (exemplified in the songs of Kim Min-ki) and a move towards the militant style influenced by the Marxist composer Hanns Eisler. It argues that minjung kayo embodied the complex relationship South Korean activists held with their colonial past and autocratic present, as well as visions of their democratic future.