Spirituals is a genre of songs originating in the United States and created by African Americans. Spirituals were originally an oral tradition that imparted Christian values while also describing the hardships of slavery. Although spirituals were originally unaccompanied monophonic songs, they developed into harmonized choral arrangements. 

Swing low sweet chariot– Etta James and choir https://www.youtube.com/watch?v=Thz1zDAytzU 

Nobody knows the trouble I have seen  - Louis Armstrong (trumpet and vocals) https://www.youtube.com/watch?v=SVKKRzemX_w 

Oh happy day  - the Edwin Hawkins singers https://www.youtube.com/watch?v=EfGDvDGE7zk