What are some of the important similarities in the rise of country and western and rhythm and blues, English homework help

What are some of the important similarities in the rise of country and western and rhythm and blues, especially during the 1945-55 period? What are some of the significant differences?
What was the relationship between mainstream pop, country and western, and rhythm and blues in the 1940’s and ’50’s? How did the music business separate out these styles? Why?
Radio plays a central role in the discussions of this unit. How does it affect each of the three styles under consideration? What role does television play?
What’s the difference between focusing on the sale of songs and focusing on the sale of records? How does this relate to the three styles under consideration?
If many Americans had prejudices against country and western and rhythm and blues music, was this because of their perceptions of the intended audiences for each style? Did country and western and rhythm and blues have features that may be seen to reinforce negative stereotypes?