John Philip Sousa was an American composer and conductor of the late Romantic era known primarily for American military marches. He is known as "The March King" or the "American March King", to distinguish him from his British counterpart Kenneth J. Alford. Among Sousa's best-known marches are "The Stars and Stripes Forever", "Semper Fidelis", "The Liberty Bell", "The Thunderer", and "The Washington Post".
Sousa began his career playing violin and studying music theory and composition under John Esputa and George Felix Benkert. Sousa's father enlisted him in the United States Marine Band as an apprentice in 1868. Sousa left the band in 1875, and over the next five years, he performed as a violinist and learned to conduct. In 1880, Sousa rejoined the Marine Band and served there for 12 years as director. In 1892 he left the Marine Band and organized the civilian Sousa Band. From 1880 until his death, Sousa focused exclusively on conducting and writing music. He aided in the development of the sousaphone, a large brass instrument similar to the helicon and tuba.