Which musician studied in this chapter wrote a song that was later picked up by Louis Armstrong?

Justo Azpiazú is the correct choice because he is known for his contributions to the Cuban musical genre known as son and specifically for the song “La Cumparsita,” which was later popularized in the United States, including by Louis Armstrong. Armstrong, a major figure in jazz, often covered songs that became widely recognized, and his rendition of pieces originally composed by others helped to elevate those works on the global stage.

The other musicians listed either did not have a direct connection to songs later interpreted by Louis Armstrong or were involved in different musical styles or contexts. Understanding Azpiazú's impact on music and how his works crossed over into mainstream popularity clarifies his significance in the relationships among different musical traditions.