John Philip Sousa was an American composer and conductor, best known for his military marches. He was nicknamed 'The March King' and is often referred to as 'The American March King'. He composed the march 'El Capitan' in 1896, which became one of his most popular works. It was written for a Broadway show of the same name and was later used in several films. The march has been performed by many bands and orchestras around the world.