Question: Which popular music style was a modification of the marches from "The March King" with heavy influences from African American communities?
Sentence (from "John Philip Sousa"): Among his best-known marches are "The Stars and Stripes Forever" (National March of the United States of America), "Semper Fidelis" (Official March of the United States Marine Corps), "The Liberty Bell" (used as the theme for Monty Python's Flying Circus), "The Thunderer" and "The Washington Post".
Relevant evidence: No