Final answer:
Rock 'n' roll emerged in the 1950s from the fusion of rhythm and blues with influences from African American musicians, appealing to a teenage audience and breaking down racial barriers.
Explanation:
Rock 'n' roll began as a fusion of amplifiers, electronics, and traditional rhythm and blues, with its roots in West African call-and-response traditions. Originating in the US in the 1950s, prominent African American musicians like Little Richard and Chuck Berry laid the foundation. As the genre evolved, it attracted a teenage audience, transcending racial boundaries and playing a crucial role in challenging segregation norms.
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