Being called out on stage

[Richard Brekne]

If me memory serves me right... this general thread was prompted beyond 
its initial couple postings by a story about Keith Jarrett being unhappy 
with a tuning during the middle of a concert and demanding the piano be 
touched up.  Mr. Jarrett had, at least some years back, a reputation for 
being rather difficult about instruments... many would have it 
unreasonably so.  Not wishing to take any particular position on exactly 
that issue... I am still curious...

For those who have experienced being called on stage for your own or 
someone elses instrument at intermission or even in the middle of a 
set... how often do you feel this has been an unreasonable action on the 
part of the artist.  And I mean even unreasonable in the more harmless 
sense like when a pianist just wants the added assurance of the piano 
being gone over during the break.

Myself... it strikes me that under normal operating conditions a piano 
should hold tuning plenty well enough during a whole concert. I suppose 
by that I mean 95 % of the time at least.  Being on stage after the 
concert starts is something I've never had to do for any of my own 
work... and I've come to view it as an undesirable.  If the curtain was 
down... and audience out of eye and ear range... well perhaps it might 
be acceptable.... but really... it should nearly never be necessary.  
Extremes of climatic conditions being about the only plausible 
exception.....

What say ye ?

Cheers
RicB