Final answer:
Mainstream rock music continued the tradition of earlier rock styles by incorporating elements of blues and rhythm and blues. It combined electric instruments with African American musical traditions and resisted racial barriers, becoming a symbol of rebellion for young generations.
Step-by-step explanation:
Mainstream rock music continued the tradition of earlier rock styles primarily by A) incorporating elements of blues and rhythm and blues. The early rock sound was a combination of electric guitars and other instruments with the sounds of gospel, blues, country, jazz, and R&B. This new genre of music captivated audiences with its heavy rhythm and simple lyrics. Rock 'n' roll originated from a blend of African American musical traditions and was popularized by artists like Elvis Presley.
The legacy of rock 'n' roll is marked by its ability to break down racial barriers and bring together disparate groups of people. It was not only a form of cultural expression but also a symbol of rebellion for the younger generation. The huge demand for rock music led US businessmen to produce a significant number of rock albums, solidifying its presence in American culture.