I use this song with my 3rd and 4th graders who learn regional music and American folk music. I don't know why it took me so long to include Pete Seeger
This PowerPoint includes a brief biography of Seeger and also two videos: one of Seeger singing the song and the other of Peter, Paul, and Mary singing their version of the song.
I also used this as an example of musical form and how song form can change, so each slide of the song is labeled according to what my students thought the parts of the song should be (i.e. verse, chorus, coda, etc.)
In case the videos do not work in the PowerPoint, I've provided the links below. Feel free to embed them into the presentation: