Final answer:
John Phillip Sousa is known as the 'March King' in the U.S and elevated the march to the status of concert music.
Step-by-step explanation:
The composer who is known as the 'March King' in the U.S and elevated the march to the status of concert music is John Phillip Sousa.
John Phillip Sousa was a band director of the United States Marine Band and traveled the nation. He specialized in creating stirring marches for military bands. His most famous march, 'Stars and Stripes Forever', became one of the most beloved patriotic songs in America.