You can hear the Gandydancer recording of the song (live) at the Library of Congress online site here: https://www.loc.gov/item/webcast-4273/. The song is a bit over 51 minutes in.

You can also hear the vast majority of the other songs on their CD there as well.

They sing "I once, I once went rambling" in that recording

Otherwise, the lyrics seem to be largely correct.