By the middle of the nineteenth century, pianos weremass-produced by factories in Europe and the UnitedStates.As a result, pianos became more affordable and accessible to the middle class.A piano is a keyboard instrument that produces musical sounds when the keys are pressed.It has a metal frame and strings, and its sound is produced by the hammers striking the strings. In the eighteenth and nineteenth centuries, pianos were a popular instrument among the upper classes, who would often have them in their homes for entertainment.However, due to the high cost ofproduction, they were not widely available to the general public until mass production became possible in the middle of the nineteenth century.Therefore, by the middle of thenineteenthcentury, pianos were mass-produced by factories in Europe and the United States.As a result, pianos became moreaffordableand accessible to the middle class.To know more aboutproductionvisit:brainly.com/question/30333196#SPJ11...

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