A button accordion is a type of portable keyboard instrument that uses buttons instead of keys to produce sound. It has a set of buttons arranged in rows on one or both sides of the instrument. When the player presses a button, it opens a valve to allow air to flow over reeds inside the accordion, creating sound. The instrument has a pair of expandable and contractible sides that push air through the reeds. Button accordions are often used in folk, traditional, and regional music styles, offering a distinctive sound and a wide range of musical possibilities.

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