A common feature of African American songs was the call-and-response format, where a leader would sing a verse or verses and the others would respond with a chorus. This came from African traditions of agricultural work song and found its way into the spirituals that developed once Africans in bondage began to convert to Christianity and from there to both gospel music and the blues. Also evident were field hollers, shouts, and moans, which may have been originally designed for different bands or individuals to locate each other and narrative songs that used folk tales and folk motifs, often making use of homemade instruments... http://en.wikipedia.org/wiki/Work_song
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