This is called a "topic sentence." It's common for paragraphs to have the main idea be the first sentence, because this allows the author to set up the rest of the paragraph and explain things immediately after the topic sentence.
I believe the answer is Gospel music.
Answer: El chamariz en el chopo
-Y que' mas?
El chopo en el cielo azul
-Y que' mas?
El cielo azul en el agua
-Y que' mas?
El agua en la hojita nueva
-Y que' mas?
La hojita nueva en la rosa
-Y que' mas
la rosa en mi corazon'
-Y que' mas
imi corazon' en el tuyo
