The Virus spreads from life form to life form, infecting it with a twisted disease. However, it does not spread, as when another thing is infected the original host dies. There can only ever be one host.
There are several stages of infection, determined by voice quality, stance and musical prowess.
As the infection progresses through a person, their voice becomes less understandable, their musical prowess advances (or at least they think it does) and their stance gets more... camp.
The Hosts of the virus tend to hang around Minas Music , adding to its vile corruption. The recent host of the Virus, Host Chatee, has apparently created a virtual version of the virus and infected the main computer of the Goodfellas using a twisted instrument of Minas Music.