Final answer:
It is false to claim that Rock and roll is considered 'illegitimate' in mainstream Islamic beliefs. Condemnation varied and was not limited to religious beliefs, as rock and roll also faced criticism for its cultural impact during the 1950s from conservative groups, but nonetheless, it played a significant role in shaping American youth culture and breaking racial barriers.
Step-by-step explanation:
The statement that popular music from the "Western" world, such as Rock and roll, is regarded as "illegitimate" musical activity in accordance with mainstream Islamic beliefs is false. Islamic views on music vary widely and are not monolithic, and there is no single Islamic belief that universally condemns or considers Western popular music as illegitimate. From a historical perspective, rock and roll often faced condemnation from various conservative circles due to its perceived promotion of rebellious youth culture and its roots in African-American rhythm and blues. However, it grew in popularity massively and contributed to breaking down racial barriers and shaping the youth identity in America during the 1950s. Rock and roll was seen as a form of expression and even rebellion against conservative values, but it was embraced by the youth regardless of the criticism it faced from adults.