Why did rural blues and country music become louder in American cities after World War II?

After World War II, rural blues and country music became louder in American cities primarily due to the Great Migration, which saw hundreds of thousands of Southerners move to northern industrial cities for work. As these musicians performed in crowded, noisy clubs and bars, they needed to increase their volume to be heard over the audience.1234

This transition necessitated the use of electric guitars and amplification, which allowed instruments to project clearly and compete with the noise of urban venues. Additionally, as Black dance bands became smaller for economic reasons, they replaced traditional brass and wind sections with amplified guitars, bass, and miked-up vocals, while keyboards and saxophones were repurposed to emphasize the beat. Country dance bands, influenced by jazz-based western swing, adopted similar changes by amplifying their instruments and focusing on the singer's personality. These developments in live performance helped shape the driving, rhythmic intensity of urban blues and honky tonk, which eventually laid the foundation for rock and roll.143