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why does my piano go out of tune?

The primary reason the piano goes out of tune – change of pitch, is due to contraction and expansion of the strings. Reason for this is temperature variation – atmospheric variations, particularly humidity. When the tension in a string changes, the pitch will also change, resulting in a note that is out of tune. Tuning pins can lose tension and slip, thus allowing movement of the strings effecting the tuning of the piano.