Riverbeds and Railways.

Throughout the history of the African people music has played a key role in the lives and everyday occurrence of the common man. No more important had the song been than in the days of slavery. It's become common knowledge that most songs sung by slaves during the back breaking arduous work, were in fact clues to freedom. Two of the most famous songs from that slaves sang were "Wade In the Water" (telling of how to lose bloodhounds by drowning their scent in water)and "Drinking Gourd" (telling of marked trees and times to escape to "Jordan" or Canada) were successful in leading those wishing to escape to riverbeds running north and safe houses along the path. Looking at the history of music as a medium to convey secrets, what songs come to mind currently that have a double entente? If none come to mind, what has music evolved into? Has it evolved from a form of literally escaping slavery to something helping to escape the figurative slavery of ones thoughts on life, or something more?