Answer
Marches are Sousa's claim to fame. He composed some of the most iconic marches in American history, including "The Stars and Stripes Forever" and "The Washington Post March." Sousa's marches were known for their stirring melodies, rhythmic drive, and patriotic themes, and they were often performed by military bands and civilian marching bands. Sousa's marches helped to popularize the genre and make it a staple of American musical culture.