Final answer:
The rock music styles of the 1970s were influenced by gospel, blues, country, jazz, and R&B. These styles, along with social changes, helped shape rock 'n' roll's development, blurring racial lines and reflecting civil rights progress.
Step-by-step explanation:
Many of the rock music styles of the 1970s grew out of a combination of electric instruments with the sounds of gospel, blues, country, jazz, and R&B, which were deeply rooted in African American culture. These genres, along with the societal shifts of the time, played a pivotal role in the development of rock 'n' roll, a genre that acted as a form of rebellion and cultural exchange.
The rise of rock 'n' roll in the 1950s, exemplified by figures such as Elvis Presley, paved the way for its evolution in the 1970s by blurring racial lines and challenging the status quo, paralleling the civil rights advancements and cultural revolutions of the era.