The Madness of Duke Venomania presented in a point of view that is quite easily more understandable than the song. If your listening to the song and reading the lyrics and you still don't get it after like the fifth time, you've got this! >~<

Envy. One of the worst sins known to man. The tailor doesn't know this but she suffers from it. Mr. Jealousy. He's riding in her back enjoying the ride.