Final answer:
It is true that at the beginning of the swing era, bands were not racially integrated. Racial integration in music occurred later, and the rock and roll movement significantly contributed to the blurring of racial lines and advancements towards ending segregation.
Step-by-step explanation:
At the beginning of the swing era, bands were not racially integrated. The correct answer to this statement is True. Racial integration in music bands, particularly in genres like swing, was not common in the early stages of the swing era. It was not until later, with the advent of rock and roll and other musical movements, that racial lines began to blur more significantly. Rock and roll played a key role in challenging racial barriers and contributed to social advancements that led to the reduction of certain forms of segregation across the nation. This was part of a wider shift in American society that included various social and economic changes, such as those brought about by the market revolution.