What constitutes for a "fall" of a certain celebrity? Is it not when that celebrity has begun to actually decline in all aspects, be it sales, popularity amongst the public, etc.? Is it not when that celebrity disappears from the public eye and all the attention that has been directed towards him/her has faded? That's just a thesis of mine. I may be wrong.
It's hard to really pick a favorite out of the many periods and albums. I can't decide.