What causes a piano to go out of tune?

Unless you are a conservatory, the main cause of change in your piano's tuning is humidity, not usage. The piano soaks up moisture in the summer and the pitch goes up. In the winter it dries out, the wood shrinks and the pitch goes down.

If it did this evenly, it wouldn't be so bad, but the center of the piano and the lower treble react more than the high treble and the bass sections. Add to that the fact that after one year of this, the piano's pitch will be significantly lower than it was at the start, and it will go flatter after each cycle.

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