<P> Rather than rely on CGI, Burton wanted the 40 squirrels in the Nut Room to be real . The animals were trained every day for 10 weeks before filming commenced . They began their coaching while newborns, fed by bottles to form relationships with human trainers . The squirrels were each taught how to sit upon a little blue bar stool, tap and then open a walnut, and deposit its meat onto a conveyor belt . "Ultimately, the scene was supplemented by CGI and animatronics," Burton said, "but for the close - ups and the main action, they're the real thing ." Wonka's Viking boat for the Chocolate River sequence floats down a realistic river filled with 192,000 gallons of faux melted chocolate . "Having seen the first film, we wanted to make the chocolate river look edible," McDowell said . "In the first film, it's so distasteful ." The production first considered a CGI river, but Burton was impressed with the artificial substance when he saw how it clung to the boat's oars . Nine shades of chocolate were tested before Burton settled on the proper hue . </P> <P> The original music score was written by Danny Elfman, a frequent collaborator with director Tim Burton . Elfman's score is based around three primary themes: a gentle family theme for the Buckets, generally set in upper woodwinds; a mystical, string - driven waltz for Willy Wonka; and a hyper - upbeat factory theme for full orchestra, Elfman's homemade synthesizer samples and the diminutive chanting voices of the Oompa - Loompas . </P> <P> Elfman also wrote and performed the vocals for four songs, with pitch changes and modulations to represent different singers . The lyrics to the Oompa - Loompa songs are adapted from the original book, and are thus credited to Roald Dahl . Following Burton's suggestion, each song in the score is designed to reflect a different archetype . "Wonka's Welcome Song" is a maddeningly cheerful theme park ditty, "Augustus Gloop" a Bollywood spectacle (per Deep Roy's suggestion), "Violet Beauregarde" is 1970s funk, "Veruca Salt" is 1960s bubblegum pop / psychedelic pop, and "Mike Teavee" is a tribute to late 1970s hard rock (such as Queen) and early 1980s hair bands . </P> <P> The original motion picture soundtrack was released on July 12, 2005 by Warner Bros. Records . </P>

Willy wonka and the chocolate factory 2005 plot