Blues

The blues is a vocal and instrumental form of music based on the use of the blue note. It emerged as an accessible form of self-expression in African-American communities of the United States from spirituals, work songs, field holler, shouts and chants, and rhymed simple narrative ballad. The use of blue notes and the prominence of call-and-response patterns in the music and lyrics are indicative of Africa influence. The blues influenced later American and Western popular music, as it became... full article at wikipedia