 The project went through an intensive period of matching music to visuals requiring multiple iterations of back-and-forth alterations in which both music (sometimes from the first note) and art (including entire bosses) were significantly modified.During early production, Ebizoo used placeholder tracks by Fatboy Slim and Underworld for test levels.Hiroishi contacted multiple composers to contribute tracks for each zone; these included Ken Ishii and Joujouka; and European disco figures Coldcut and Adam Freeland.