The Delta blues is one of the earliest styles of blues music. It originated in the Mississippi Delta, a region of the United States that stretches from north to south between Memphis, Tennessee, and Vicksburg, Mississippi, and from east to west between the Yazoo River and the Mississippi River. The Mississippi Delta is historically famous for its fertile soil and the poverty of farm workers living there. Guitar and harmonica are the dominant instruments in Delta blues. Vocal styles range from introspective and soulful to passionate and fiery.