Why do some pianos stay in tune longer than others?

Actually, all pianos go out of tune continuously. It just may take a while before you notice it. How soon you notice it depends on such factors as the design of the piano (though, interestingly, not necessarily on its quality), the various pressures and tensions being exerted on the soundboard and structural elements, climatic changes, your ear and sensitivity to out-of-tuneness, and on the kind of music you play.

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