The 12 bar blues is one of the most prominent chords progression in popular music. The blues progression has a distinctive form in lyrics, phase, chords structure and duration. In its basic form, it is predominant chord is based on the i-iv-v chords of a key. Glossary: Chord progression: Is a series of musical chords or chord changes that “aims for a definite goal” Distinctive: Its different so it is easy to recognise. Predominant chord: Is any chord which normally resolves to a dominant chord. i-iv-v chords: Is a common chord progression and cadence that, “unequivocally defines the point of origin and the total system, of the key.”

 The Atlantic slave trade or trans-lantic slave trade took place in the 19 th century. The last majority of those who enslaved were transported into a new world. Many on the triangular trade route and its middle passage were Africans from central and western parts. West Africans to western European slave traders or by way of the slave trade became the most numerous old-world immigrants in both north and south America before the late 18 th century.

 Little is known about the exact origin of the music now known as the blues. No specific year can be cited as the origin of the blues, largely because the style evolved over a long period and existed in approaching its modern form before the term blues was introduced and before the style was thoroughly documented. Gerhard Kubik traces the roots of many of the elements that were to develop into the blues back to the Africans continent, the "cradle of the blues". One important early mention of something closely resembling the blues comes from 1901, Mississippi described the songs of black workers which had lyrical themes and technical elements in common with the blues.