Why do my piano’s keys sometimes stick?

Sticking keys are usually caused by humidity changes. Interestingly, keys can stick in both humid and dry weather. Humid weather can cause wood and cloth to swell and interfere with the movement of other parts. Dry weather can cause holes to contract and bind on guide pins. In most cases, the remedies are fairly simple, such as sanding or repositioning swollen parts, expanding tight holes, and lubricating.

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