If your piano is NOT TUNED on a regular basis (once or twice a year) or if your piano was exposed to important humidity variations, the pitch of the piano may have changed significantly.

A piano is usually tuned to 440 Hz (middle A). This midddle A (along with all the other notes on the piano) pitch will eventually change (rise but most of the time drop) after time or after being exposed to environmental changes such as extreme dry / humid conditions or frequent moves and handling. Also, heating and cooling on a daily basis due to direct sunlight will affect the piano's pitch.

After time, the piano notes will be so sharp or flat, bringing them back to the standard reference 440 Hz will be impossible in one tuning. If your piano is +- 15 cents (15 % of a semitone), it should be tuned in 2 steps for maximum tuning stability.

The first part of the process, the pitch raise, is done to stretch / release the strings to their correct pitch. The second part consists of fine tuning your piano. Please note that if your piano has not been tuned in a very long time, more than 1 pitch raise may be required in order to stabilize the instrument.

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