Re "Dem Bones Gonna Rise Again":

I've found some online versions of this song that have this verse:

Serpent crawling around that trunk.
Dem bones gonna rise again
At miss Eve, his eye he wunk.
Dem bones gonna rise again

Source: http://www.scoutsongs.com/lyrics/dembones.html

And other online versions that subsitute 'Satan' for 'serpent' like here:

Round that tree old Satan slunk
Dem bones gonna rise again
At Miss Eve his eye he wunk.
Dem bones gonna rise again

Source: http://ingeb.org/spiritua/dembones.html

I think that the serpent version is probably the oldest one, since a serpent 'slunking' makes more sense than Satan slunking. But it's an open question as to whether serpents can 'wink' or not...