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Why does the piano go out of tune?

The primary reason strings in a piano change pitch is because they move. This movement is mainly caused by atmospheric variations, particularly humidity. When the tension in a string changes, the pitch also changes, resulting in a note that is out of tune with respect to the other notes in the piano.

Strings can also move because of loose tuning pins. These pins are the ones that
hold the string in place and are turned during a tuning. When the tuning pins have lost considerable tension (typically in older pianos), movement of the string is again possible.