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(詳細はaccordion on which the melody-side keyboard consists of a series of buttons rather than piano-style keys. The first button accordion is credited to Franz Walther in 1850. ==Types of Button Accordions== A wide variation in keyboard systems, tuning, action and construction of these instruments exists. The two main examples of this are the chromatic button accordion and the diatonic button accordion. The single row button accordion, also known as the Cajun accordion to scholars, is another version of the button accordion. Diatonic Button Accordion The diatonic button accordion has two or three rows of buttons, each row tuned to a certain key. They are usually seen in music genres such as Cajun and Norteño music. Also considered Bisonoric, meaning that the same button can produce two sounds. Another feature is that accidentals are not included, usually there will be a third row of buttons to represent the accidentals (which in turn makes it a chromatic diatonic). Chromatic Button Accordion The chromatic button accordion is unisonoric meaning that the same button produces one sound. This accordion also has 3-5 rows of buttons and are not limited to one specific key as are the diatonic button accordions. This type of accordion is very popular in French music.〔(【引用サイトリンク】publisher=The Arhoolie Foundation )〕 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「button accordion」の詳細全文を読む スポンサード リンク
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