Showbiz covers everything from Shakespeare to soap operas, from opera (in the musical sense of the word) to mass-produced "artists" in current pop music. The word itself is as meaningless as anything. Defining "Showbiz" is just as controversial as defyning folk music (as we all know)
Regards
Ernest
P.S.: The episode Stephen L. Rich told above is not very good showmanship.... ;0)