What is a semitone in piano

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The technician did not have much of a clue other than doing the cabinetry I think.Īnyway, this piano was never in Concert Pitch to begin with but a semitone (half step) down. I'm sad because although cosmetically it looks better, it plays very badly now. I have an antique upright Shubert Piano that was manufactured in the late 1880's. I'm not a tuner or tech but I'm posting this here as I'm sure this is where I'll probably find the best answers to my questions.