Agh no I just misremembered lol. My analysis is null and void.

I was going to say though in a world of brand names and materialism, music is one of the only truly genuine things so...it seems like killing and listening to music are the only things that make him feel truly alive.

Psychopathic as he is, he's unable to derive meaning and fufillment from benevolent or altruistic activites.