He's a Pirate

From PotC Wiki

"He's a Pirate" is a musical theme credited to Klaus Badelt for Pirates of the Caribbean: The Curse of the Black Pearl. It appears as track fifteen on the film's soundtrack, at 1:30 in length.

The track is best known as the main theme for the Pirates of the Caribbean films. It is featured at the end of each film, and is the first theme heard as the end credits roll. A slight variation appears in the middle section of "Drink Up Me Hearties" on the Pirates of the Caribbean: At World's End soundtrack. It takes its name from a repeated line in the film referring first to Jack Sparrow ("He's a pirate!", exclaimed by Weatherby Swann, to which William Turner replies with "And a good man!") and later to William Turner as Elizabeth Swann's final line in the film.

The cue also appears on Epics: The History of the World According To Hollywood as "Pirates of the Caribbean". A series of remixes were released on a CD entitled "Pirates Remixed".