This article examines the Great Migration (1916-1970) as the fundamental demographic catalyst for the transformation of jazz from a regional folk tradition into a national art form. It argues that the mass movement of approximately six million African Americans from the rural South to the urban North and West did not merely relocate musicians, but created the essential conditions for jazz’s modernization, commercialization, and artistic evolution. Through analysis of migration patterns, urban settlement, and the resulting cultural infrastructure, this article demonstrates how the concentration of Black populations in cities like Chicago, New York, and Detroit generated the critical mass of…

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