Africans have developed systems of classification of songs. The Bahutu of Ruanda (Burundi) have at least twenty-four different t
ypes of ___________. There are songs played by professional musicians for entertainment, songs for harvesting and other work songs, war songs, beer drinking songs, songs commemorating the birth of children, songs admonishing erring members of the society, songs deriding Europeans, vulgar songs, etc. Social songs are separated from ceremonial or religious song.
There were actually several building techniques that were introduced by the Romans, but perhaps the most important was the bridge building technique that allowed bridges to be built without supports.
