The form 4562 should only be filed in the year you purchase the asset and set it up for depreciation.
If you sell the piano, you will have to subtract the depreciation allowed over the years from the cost to determine the adjusted basis of the asset. You will then net the sale amount with the adjusted basis to determine the gain or loss on sale of the asset.
Since there is depreciation you never deducted and got a tax benefit for, you may end up with an adverse consequence if you sell the asset one day.
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