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Duet concertina
The Duet concertina is a family of concertinas, distinguished by being ''unisonoric'' (producing the same note on the push and pull of the bellows, unlike the Anglo concertina) and by having their lower notes on the left and higher on the right (unlike the English concertina).
Instruments built according to various ''duet'' systems are the last development step in the history of the instrument and less common than other concertinas. Duet concertina systems aim to simplify playing a melody with an accompaniment. To this end the various duet systems feature single note button layouts that provide the lower (bass) notes in the left hand and the higher (treble) notes in the right, usually with some overlap (like a two-manual organ).
==History==
Sir Charles Wheatstone was the first to patent a Duet concertina, in 1844; this followed his 1829 patent of the English concertina.
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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