Came upon this reference when I was looking for information last year, but cannot open the link now. Don't know whether it will help.

http://www.assumption.edu/dept/history/His130/neh%20curricular/SingTwoStanzas.html
Perhaps the most poignant song of the discontent and rebellious slave was "Oh Freedom." This song contained no dual meaning and its singing was punishable by the lash or death. This was the "theme song" if you will, of the black rebel. He refused to be enslaved any longer and was openly willing to die for his freedom.