" john charles, why would he change? if you dont know the answer to that   here is the answer,it should be different every perfomance should be different. "
By only quoting part of what I have said you distort its meaning.
Spending time to hone the performance and then deciding that you must sing it differently each time seems a rather odd way of going about the process, why bother practicing.
You seem happy to put everyone else, right but cry foul when anyone contradicts you or refers to your singing. As a professional surely you might expect your performances to be reviewed more critically than many of us who pursue our art for love not money.
john