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In music, the organ (from Greek ὄργανον ''organon'', "organ, instrument, tool")〔(Organon ), Henry George Liddell, Robert Scott, ''A Greek-English Lexicon'', at Perseus project〕 is a keyboard instrument of one or more divisions, each played with its own keyboard, played either with the hands or with the feet. The organ is a relatively old musical instrument,〔The organ developed from older musical instruments like the panpipe, therefore is not the oldest musical instrument.〕 dating from the time of Ctesibius of Alexandria, who is credited with inventing the water organ. It was played throughout the Greek and Roman world, particularly during races and games.〔Douglas Bush and Richard Kassel eds., ("The Organ, an Encyclopedia." ) Routledge. 2006. p. 327.〕 During the early medieval period it spread from the Byzantine Empire, where it continued to be used in secular and imperial court music, to Western Europe, where it gradually assumed a prominent place in the liturgy of the Catholic Church.〔 Subsequently it re-emerged as a secular and recital instrument. ==Overview== Pipe organs use wind moving through pipes to produce sounds. Since the 16th century, pipe organs have used various materials for pipes, which can vary widely in timbre and volume. The pipes are divided into ranks and controlled by the use of hand stops and combination pistons. Although the keyboard is not expressive as on a piano and does not affect dynamics (pressing a key only turns the sound on or off), some divisions may be enclosed in a swell box, allowing the dynamics to be controlled by shutters. Some organs are totally enclosed, meaning all the manuals and the pedals can be controlled by one set of shutters. Some special registers with free reed pipes are expressive. These instruments vary greatly in size, ranging from a cubic yard to a height reaching five floors,〔The Wanamaker Organ is built from the 2nd to 7th floors.〕 and are built in churches, synagogues, concert halls, and homes. Small organs are called "positive" (easily placed in different locations) or "portative" (small enough to carry while playing). Increasingly hybrid organs are appearing in which pipes are augmented with electronic additions. Great economies of space and cost are possible especially when the lowest (and largest) of the pipes can be replaced. Non-piped organs include the reed organ or harmonium, which like the accordion and harmonica (or "mouth organ") use air to excite free reeds. Electronic organs or digital organs, notably the Hammond organ, generate electronically produced sound through one or more loudspeakers. Mechanical organs include the barrel organ, water organ, and Orchestrion. These are controlled by mechanical means such as pinned barrels or book music. Little barrel organs dispense with the hands of an organist and bigger organs are powered in most cases by an organ grinder or today by other means such as an electric motor. 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「Organ (music)」の詳細全文を読む スポンサード リンク
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