Readers may find some interesting reading about concert pitch at
http://www.wam.hr/Arhiva/US/Cavanagh_440Hz.pdf  some of which appears
to have been copied to the Wikipedia article on the subject, and
especially at http://www.dolmetsch.com/musictheory27.htm  I had not
known, for instance, that the organ in St Paul's in London was/is
A=444.6, and some were much higher pitch.

I'm of the camp that says tune the piano and pipes to the xylophone's
pitch, not the other way around.

z!
Carl Zwanzig