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 McDonaldhttps://www.youtube.com/watch?v=2_S1bjRmVu4
And a more recent one by Kim & Reggie Harris:https://www.youtube.com/watch?v=TB2HmO9vHtU