Valves on opposing reeds of each note are used to make the instrument's reeds sound louder without air leaking from each reed block. These vibrate to produce sound inside the body.
The accordion is played by compressing or expanding the bellows while pressing buttons or keys, causing pallets to open, which allow air to flow across strips of brass or steel, called reeds. The harmonium and American reed organ are in the same family, but are typically larger than an accordion and sit on a surface or the floor. The concertina and bandoneón are related.
A person who plays the accordion is called an accordionist. Accordions (from 19th-century German Akkordeon, from Akkord-"musical chord, concord of sounds") are a family of box-shaped musical instruments of the bellows-driven free-reed aerophone type, colloquially referred to as a squeezebox.
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