If you perform, you have every expectation of play or singing your song the way you want it..........

To insist on doing this where the expectation is that the people present will play and sing together, is a little hard on them, is it not? Stay at home and do it exactly as you want it.

The way to look at it is just to accept the way the music is made, at that moment in time..... It may sound horrible sometimes? ...Sometimes it may sound wonderful?

You won't know which one of those it was, until it is finished.

Does not the way forward lie somewhere between not being 'precious' and not being bad-mannered?