What does it mean to “tune” a piano?

Tuning is the process of adjusting the tension at which the strings are stretched, using a wrench called a tuning hammer, so that all the strings vibrate in pleasing harmony with one another in accordance with certain acoustical laws and aesthetic and musical customs. Although the tuner may also perform other adjustments to the piano at the same visit, strictly speaking, only the above process constitutes “tuning.” A good article on the subject can be found here.

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