What is the theme in American Psycho by Bret Easton Ellis?

Music is an important theme in this novel because it is important enough to Bateman that he makes several side trips into the discussion of music during the writing of his story. Bateman discusses in detail Genesis, Whitney Houston, and Huey Lewis and the News in this novel, giving the reader insight into what Bateman believes is the best thing about these groups/singers, and what is the worst. Bateman also uses these forays into musical discussion as a way to reground himself when things become difficult. At one point, Bateman is seen shooting a musician on the street. Bateman is chased by the police and finds himself hiding out in his office. This section leaves Bateman on the phone with his lawyer, confessing to all his crimes. The next section is a dissection of the music of Huey Lewis and the News.