The correct answer is:
by repeating the idea that the blues is a musical form
Explanation: The writer creates cohesion between the first and second paragraphs by emphasizing that the blues is a musical form. In the first paragraph, the blues are introduced as a musical genre with historical background and cultural significance. The second paragraph continues to discuss the characteristics of the blues specifically as a musical form, focusing on its lyrical nature and instrumental components. This repetition of the overarching concept of the blues being a musical form helps to link the two paragraphs together, providing a clear thematic continuity throughout the text.