Concertina is a small-to-medium-sized keyboardless musical instrument, typically accordion-like in action, with bellows and button or steel reeds producing notes as you push and pull. It can also refer to a fan-shaped, expandable wire-wind instrument, or, in some contexts, a small, portable object that expands or contracts. The term emphasizes its portable, squeezable nature and its characteristic bellows-driven sound.
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