The tune for this song seems to be built on "Wayfaring Stranger."

Here's a recording by Barbara Dane with the Chambers Brothers:

https://www.youtube.com/watch?v=1OXxCc-Lw88

And an old recording by Country Joe McDonald

https://www.youtube.com/watch?v=2_S1bjRmVu4

And a more recent one by Kim & Reggie Harris:

https://www.youtube.com/watch?v=TB2HmO9vHtU