Rocktard
a relatively unknown non celebrity who is involved in music (although not many people know or care for it)and seems to think they are in legendary status and behave like they are a rockstar. Live in fantasy land inside their own head, population: 1. 
changing ones first name to "vegas", then going on stage during a gig in a v small town and announcing the new name to  the crowd of 5, is a beautiful example of a rocktard..