A "march king" is a term often used to describe a composer of marches, especially during the late 19th and early 20th centuries. Some synonyms for this term could include "band master," "marching band composer," "military band leader," or "march composer." These terms all describe someone who creates music specifically for marching bands or military parades and processions. Some notable individuals who have been called "march kings" include John Philip Sousa, Francis Johnson, and Henry Fillmore. These composers are often associated with patriotic tunes that are still played today, such as Sousa's "Stars and Stripes Forever." Overall, the term "march king" describes a specific type of musical composer and their unique style of music.