This document consists of the following elements: (1) an examination of Healey Willan's background in the English Cathedral tradition; (2) a study of the formation of his compositional style based on his knowledge of English composers and treatises of the day; (3) a look at the German influences on his compositional style; and (4) an analysis showing how he merged these styles into a unified whole to create a monumental work for the organ. Included are musical examples of English and German keyboard works compared with examples from Willan's introduction, Passacaglia and Fugue in order to illustrate the use of similar compositional devices and stylistic traits. Also included is a discussion of the evidence of Willan's individuality as a composer in spite of numerous derivative sources.