Just for those who have no idea what "pop" means : it stands for "popular" music.
As you've probably pieced it all together already, you don't have to be a boy-band or Britney to be considered POP. As long as your stuff can be exploited to ALL the kiddies out there beyond the milking point, you're POP.
I personally don't care whether music is considered pop or not. If it's good, I'm a happy camper.