He marched with Dr Martin Luther King Jr in the ’60s and sang Woody Guthrie’s “This Land is Your Land” in 2009 at the inauguration of President Barack Obama.

Biggest Thing That Man Has Ever Done (The Great Historical Bum); Judy Collins & Pete Seeger: Union Maid; Robert Ryan/Will Geer/Judy Collins: Narration; Odetta, Will Geer, Arlo Guthrie with Full Cast: ...