One of the earliest exponents of march music in America and its preeminent champion was John Philip Sousa, "The March King"; who revolutionized and standardized American march music during the 19th and early 20th centuries. Some of his most famous marches—"Semper Fidelis", "The Washington Post", "The Liberty Bell March", and "The Stars and Stripes Forever"—are among the best known of historical American music and are especially revered by many Americans for their rousing strains and patriotic themes. His "Stars and Stripes Forever" features what is arguably the most famous piccolo obligato in all of music.