The correct answer is by repeating the idea that the blues is a musical form.
Explanation: The cohesion between the first and second paragraphs is achieved through the repeated emphasis on the blues as a distinct musical form. The first paragraph introduces the blues as a genre and provides context about its origins and influence on other musical styles. The second paragraph continues discussing the blues by detailing its characteristics as a musical form, highlighting its lyrical nature and musical elements. This thematic repetition helps to create a connection between the two paragraphs, reinforcing the understanding that the blues is not just a cultural or historical phenomenon but a specific form of music with particular traits.