Overthrowing Empires With Song
Estonians regained their independence from the Soviet Union not through weapons, but by singing. Between 1986 and 1991, hundreds of thousands of citizens gathered to sing banned national songs, successfully paralyzing the occupation.
During the dark years of Soviet control, public displays of Estonian national identity were strictly forbidden. People defiantly gathered at massive music festivals to belt out patriotic anthems that had been outlawed by the state. The sheer scale of these crowds made it impossible for authorities to suppress the movement without risking a massacre. This peaceful display of unity ultimately fractured the occupation and led to the restoration of Estonian sovereignty.
Source: The Singing Revolution