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Keyboards : ウィキペディア英語版
Keyboard instrument

A keyboard instrument is a musical instrument played using a keyboard. The most common of these are the piano, organ, and various electronic keyboards, including synthesizers. Other keyboard instruments include celestas, which are struck idiophones operated by a keyboard, and carillons, which are usually housed in bell towers or belfries of churches or municipal buildings.
Today, the term ''keyboard'' often refers to keyboard-style synthesizers. Under the fingers of a sensitive performer, the keyboard may also be used to control dynamics, phrasing, shading, articulation, and other elements of expression—depending on the design and inherent capabilities of the instrument.〔
Another important use of the word ''keyboard'' is in historical musicology, where it means an instrument whose identity cannot be firmly established. Particularly in the 18th century, the harpsichord, the clavichord, and the early piano were in competition, and the same piece might be played on more than one. Hence in a phrase like "Mozart excelled as a keyboard player" the word ''keyboard'' is usefully noncommittal.
== History ==
The earliest keyboard instruments include the pipe organ, hurdy-gurdy, clavichord, and harpsichord. The organ is the oldest of these, appearing in the third century BC—though this early instrument, called hydraulis, did not use a keyboard in the modern sense. From its invention until the fourteenth century, the organ remained the only keyboard instrument. Often, the organ did not feature a keyboard at all, but rather buttons or large levers operated by a whole hand. Almost every keyboard until the fifteenth century had seven naturals to each octave.
The clavichord and the harpsichord appeared during the 14th century—the clavichord probably being earlier. The harpsichord and clavichord were both common until widespread adoption of the piano in the 18th century, after which their popularity decreased. The piano was revolutionary, because a pianist could vary the volume (or dynamics) of the sound by varying the vigor with which each key was struck. The piano's full name is ''gravicèmbalo con piano e forte'' meaning ''harpsichord with soft and loud'' but can be shortened to ''piano-forte'', which means ''soft-loud'' in Italian. In its current form, the piano is a product of the late 19th century, and is far removed in both sound and appearance from the "pianos" known to Mozart, Haydn, and Beethoven. In fact, the modern piano is significantly different from even the 19th-century pianos used by Liszt, Chopin, and Brahms.〔 ''See Piano history and musical performance''.
Keyboard instruments were further developed in the early twentieth century. Early electromechanical instruments, such as the Ondes Martenot, appeared early in the century. This was a very important contribution to the keyboard's history.〔(【引用サイトリンク】url=http://www.piano.about.com )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Keyboard instrument」の詳細全文を読む



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