Windows users: right click
the link above, choose "Save Target As" and save/download
the mp3 file to disk before playing it.
(file size = 3.5 Mb)
Mac users: double click the link above, go to "File
> Save" after download is complete.
The song's lyrics were actually a code providing directions to escaping American slaves. Here're some interesting links on this song. These two give good historical contexts to the song:
http://www2.lhric.org/pocantico/tubman/gourd.htm
http://www.madison.k12.wi.us/planetarium/ftdg1.htm
The following site has the most complete version of the lyrics. (Some versions omit the "Thought I heard the angels sing" verse--personally, I suspect this verse was not originally part of the song.)
http://ingeb.org/songs/followth.html