Piano Tuning
Regular tuning, is at the heart of maintaining your piano. Tunings need to occur to compensate for changes in temperature, humidity, and vibration of strings from playing.
A rule of thumb is that tunings should be done often enough to hold pitch at A440.
The minimum requirement is at least one tuning a year although depending upon your situation and the condition of your piano this could mean up two or more tunings per year, with minor repairs and adjustments being carried out at the time of tuning and on the principal that a minor repair now negates bigger problems later on.
While manufacturers' recommendations vary on the number of yearly tunings they generally agree that a piano should be tuned at least two times a year.

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