Between 1986 and 1991, the people of Estonia protested against their Soviet occupiers in large rallies. Although these protests were fundamentally peaceful, the Estonians used a weapon powerful enough to rattle an empire: song. Patriotic songs, to be precise, which the Soviets had outlawed in Estonia. Thousands upon thousands would assemble to sing in defiance. This documentary unveils the story of a population that stood up against their oppressors with nothing but their voices and their pride.