They "invented" a kinda weird setup for the piano recordings on that record. It was basically a wooden box, shaped like a grand piano upside down, which was put some feet over the actual grand. The mics were inside that box, far away to capture a distant, roomier piano sound, but at the same time screened from the bleed of the other instruments in the tracking room.
I guess that the resonances of that box have a certain impact on the final sound, too.
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