Greetings, We tune for everything faculty,guest, senior recital, etc. I do the tuning in the morning, early, and usually get to listen to it at 7:00 that night before use. It makes no sense to worry about a cent or two spread in the octaves, nobody will ever hear it. It is all in the unisons, I think. Recording work is different, but public stage performances have a lot of tolerance. And that is before they turn the 20,000 watts worth of lights on 20 minutes before performance time!!!! I go through this anywhere from 2 to 5 times a week. The pianos and performers are all perfectly comfortable anywhere between 439 and 441. Some fixed pitch instruments need it closer, but they are rare. Regards, Ed Foote
This PTG archive page provided courtesy of Moy Piano Service, LLC