From Jarlett, Franklin. Robert Ryan: A Biography and Critical Filmography. McFarland classics, 10. Jefferson, N.C.: McFarland, 1997, page 269:

The Inheritance (not rated) (1964) 58 min. Producer/Director Harold Mayer. Associate Producer Lynne Rhodes Mayer. Writer Millard Lampell.... Music Composer and Conductor George Kleinsinger. Song Pass It On by George Kleinsinger, Millard Lampell. Songs performed by Pete Seeger, Judy Collins, Tom Paxton, Page Gaynes, Barry Kornfeld, Carla Rutolo, John R. Winn, Millard Lampell.... Narrator Robert Ryan. In cooperation with Amalgamated Clothing Workers of America, AFL-CIO, CLC.

"Freedom doesn't come like a bird on the wing,
Doesn't come down like the summer rain
Freedom, Freedom is a hard won thing,
And every generation has to win it again."

This is the theme song and the theme of Harold Mayer's documentary....