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concertina(kŏnsûrtē`nə), musical instrument whose tone is produced by free reeds. It was invented by Sir Charles Wheatstone in 1829. It is a chromatic instrument similar to the accordionaccordion,
musical instrument consisting of a rectangular bellows expanded and contracted between the hands. Buttons or keys operated by the player open valves, allowing air to enter or to escape. The air sets in motion free reeds, frequently made of metal.
..... Click the link for more information. , but its bellows are attached to hexagonal blocks having handles and buttons (finger pistons), and it is smaller. It is mainly associated with popular music.
a pneumatic musical instrument; an accordion possessing a chromatic scale but no built-in chords. It was invented in the early 19th century (patented by C. Wheatstone, London, 1829). There are six varieties of the instrument, ranging from the piccolo to the contrabass. The size of the most common concertina, the soprano, is 150–180 mm. The instrument usually has a hexagonal or octagonal shape. It has a compass of two to four octaves. Used both as a solo and orchestral instrument, the concertina is most widespread in England.