How come Hollywood undead's songs: The Kids, and Scene for Dummies, are so much

The Kids was made when it was only J-Dog and Duece. After that everyone else joined.Then Shady Jeff left. That probably has something to do with it.
Also that's just their style I think. They have party songs and sad songs. The Loss is about their friends suicide I think. I can't remember though. It was on Myspace at one time.