How interesting that this should come up as I just had a call from a regular concert venue I do where the pianist playing next week insisted that the piano be tuned to A441 (it's currently and regularly kept at A440). I do like the multiple tuning fork idea with different markings on each but tuned to the same pitch. Anyway, after being presented with the anticipated bill for moving the pitch up to 441 and then back down to 440 (each requiring a preliminary pitch raise or lowering before the fine tuning) they decided that they could live with 440. David Love www.davidlovepianos.com
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