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I've never heard of any of those so called "most performed" composers. What about Sousa?

Although Sousa wrote marches to be played in a concert environment, techically, they are not considered concert marches, but rather quick-step, military marches. See differences in article.

Also, the "most performed" composers list is in need of some additions, however, the composers listed now are indeed some of the more widely accepted concert march writers.