"Parlay" is a musical theme composed and conducted by Hans Zimmer for At World's End. It appears as track eight on the film's soundtrack, at 2:10 in length.
The track begins with a rendition of Lord Cutler Beckett's theme, which builds throughout the track until around midpoint (01:01), where a cue inspired by "Man With the Harmonica" (by Ennio Morricone from Once Upon a Time in the West) begins. Beckett's theme continues to underscore as the main theme drops (02:10).
This cue accompanies the "parlay" scene between representatives of the Brethren Court and the East India Company prior to the release of Calypso.