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Piano accordion
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A piano accordion is an accordion equipped with a right-hand keyboard similar to a piano or organ. It is more similar to that of an organ, as they are both wind instruments, but the term "piano accordion"—coined by Guido Deiro in 1910—has remained the popular nomenclature. It may be equipped with any of the available systems for the left-hand manual.
In comparison to a piano keyboard, the keys are more rounded, smaller, and lighter to the touch.

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Encyclopedia
A piano accordion is an accordion equipped with a right-hand keyboard similar to a piano or organ. It is more similar to that of an organ, as they are both wind instruments, but the term "piano accordion"—coined by Guido Deiro in 1910—has remained the popular nomenclature. It may be equipped with any of the available systems for the left-hand manual.
In comparison to a piano keyboard, the keys are more rounded, smaller, and lighter to the touch. These go vertically down the side, pointing inward, toward the bellows, making them accessible to only one hand while handling the accordion.[Felt or rubber is placed under the piano keys to control touch and key noise: it is also used on the pallets to silence notes not sounded by preventing air flow. This material eventually wears with use, resulting in a clacking noise, so has to be replaced to quieten the mechanism.]
History
The first accordion to feature a piano keyboard was probably the instrument introduced in 1852 by Bouton of Paris. Another source claimed the first piano accordion was introduced in 1854 at the Allegemeine Deutsche Industrieausstellung in München. It was showcased by the instrument builder Mattäus Bauer and quickly became a serious competitor to button accordions. As of 1972 it can be largely said that the piano system dominates the North American continent, England, and certain East European countries, while the button system is generally to be found in Scandinavia, France, Belgium and former Soviet countries. The piano accordion is also predominant in Italy, New Zealand, and Australia.
Comparison to chromatic button layout
Compared to a chromatic button layout, the advantages of using a piano layout on an accordion would be the layouts logical simplicity[One key corresponds to one note, and there are no alternate fingering options.], the relative size of the buttons for fast legato flows, and its layout compared to standard notation[With a piano accordion, there is no need to transpose the melody in a piano, organ or harpsichord piece.]. However, it has a relatively smaller range, is too big to reach notes far apart, such as two octaves, and requires more finger movement to operate.
See also
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