Here's link to a Ghanaian song that men sung while beating a huge rock with smaller rocks (as substitutes for drums)

http://www.youtube.com/watch?v=RoUNk0kb1x0&feature=related

Old African Slave Song
rorhan
November 14, 2008

"This is in northern Ghana. I went on a tour of one of the oldest slave sights. They were not allowed to play their drums, so they took rocks."