Re- the music; I think this is the music playing in Lou's head. Lou is succeeding on his own terms, living the dream. Obviously when Lou says he doesn't like people that's very reminiscent of Daniel Plainview. Both men are fulfilling their dreams; being all they can be. What they want to be appears to be externally (to the other characters who see them in the film) successful, but internally (to anyone watching the film) repellant. If this was the intent of the creator that's ambitious and impressive.
Great line when he says something like; "If you see me, it's the worst day of your life".