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Chemnitzer concertina
A Chemnitzer concertina is a musical instrument of the hand-held bellows-driven free-reed category, sometimes called ''squeezeboxes''. The Chemnitzer concertina is most closely related to the bandoneón (German spelling: ''Bandonion''), more distantly to the other concertinas, and accordions.
== Physical description ==
It is roughly square in cross-section, with the keyboards consisting of cylindrical buttons on each end arranged in curving rows. Like other concertinas, the buttons travel in a direction approximately parallel to the motion of the bellows, whereas the keys and buttons of an accordion move roughly perpendicular to the motion of the bellows. A strap, usually of leather, is fitted at each end to hold the player's palm against the instrument for playing. Compare to the English concertina where the thumb holds a strap, the little finger is held on a rest, and the remaining three fingers press the keys. The instrument is bisonoric, meaning that each button corresponds to two notes: one when the bellows is compressed, and another when it is expanded. On most instruments, two or more (and as many as five) reeds sound for each note. The tones produced are either in octaves, unison, or in some combination thereof.
Internal construction is different from other concertinas in that the action more closely resembles that of an accordion, and that the reeds are of steel (rather than brass) and are often fixed in groups of twenty or more to long zinc or aluminum plates, rather than to individual frames. This arrangement resembles that of the Russian accordion, the bayan.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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