[ ref "Mechanical Musical Instruments of Russia" ]

I believe most of the higher grade pianos -- like Mason & Hamlin,
Steinway, and Story & Clark pianos produced in the USA -- use Eastern
Canadian (Bolduc) spruce.

Sitka spruce is used in most of the Asian-built pianos like Yamaha,
Kawai, Samick and Young Chang products.  (I'm told that Yamaha uses
Eastern Canadian only in their CFIIIS Concert Grand).

Gary Jones
Southeastern Music Gallery