Probably better to avoid copywrighted music

Right now the game is a bit confusing.

Like, how do I change the music? Is it automatic? 

How are new people converted to a particular color? Is it random, dependant on the music or proximity? 

What is the use of every class that is not pink/rock? If you have lots of pinks you can win very easily, while this is not true for the other colors. I don't even know what Techno and EDM do.