I can hear your voice, and I know your story
Because of J's powers, he hears specific songs coming from people - essentially, the music of their life/soul. If you have a song you want J to hear for your character - if they have a theme, or if there's a song you think fits them particularly well - let me know below!
Mammon - Katekyo Hitman Reborn!
Their song can be essentially summed up as "Money is great and my illusions are better than you". Which sums up their life view as well, the little shit.