The sentence that best addresses the merging of folk and rock music before Dylan's transformation is, 'The fusion of folk and more-commercial genres had actually occurred prior to Dylan's bold reinvention.' This indicates that the blend of these musical styles was happening before Dylan’s shift to electric instruments. Groups like The Byrds and Peter, Paul and Mary played significant roles in this integration, laying the groundwork for Dylan's eventual influence.
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The sentence that best answers the question about the merging of folk and rock music occurring prior to Dylan's transformation into a folk-rock artist is: 'The fusion of folk and more-commercial genres had actually occurred prior to Dylan's bold reinvention.'
This sentence clearly states that the blending of folk and more commercial music styles happened before Bob Dylan made his well-known switch to electric instruments and began creating folk-rock music. The passage further supports this by mentioning The Byrds and Peter, Paul and Mary as groups that successfully integrated rock elements into their renditions of Dylan's folk songs.
This historical context is important because it helps us understand that while Dylan is often credited with popularizing folk-rock, he was building on existing musical trends. His influence, however, was significant due to his songwriting talent and awareness of social issues, which helped propel the folk-rock genre to new heights.