There are songs that change the course of history. Artur Talvik still feels moved when he hears the song that helped give his country its freedom. He's an Estonian filmmaker who grew up under the iron thumb of the Soviet Union. He used to attend huge song festivals, where Estonians would sing "My Homeland is My Love." That song helped remind them of their dream of freedom, and it gave them courage when, in 1991, Artur and other Estonians stood down Soviet tanks. Also in this episode: remembering William F. Buckley.