He's a Psychopath. He's Glib. His choice of music are all hyper produced, shallow, just like him. His Huey Lewis bit is a lecture on conformity. They are him manufacturing himself by proxy - which is what psychopath's do. They have no identity of their own so they need to find and borrow/steal bits from other people's to make themselves real. Andrew Cunanan is a good RL example of this.

The music is a stable thing he can fix on and a material icon of success (Phil Collins' story in Genesis for example, sort of mirrors his own in his family).