Ella Jenkins - Wade In The Water"

"Because many slaves knew the secret meanings of these songs, they could be used to signal many things. For example, Harriet Tubman used the song 'Wade in the Water' to tell escaping slaves to get off the trail and into the water to make sure the dogs slavecatchers used couldn’t sniff out their trail. People walking through water did not leave a scent trail that dogs could follow" (daqui)