"The term squeezebox (also squeeze box, squeeze-box) is a colloquial expression referring to any musical instrument of the general class of hand-held bellows-driven free reed aerophones ...
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such as the accordion and the concertina. The term is so applied because such instruments are generally in the shape of a rectangular prism or box, and the bellows is operated by squeezing in and drawing out.
Accordions (including piano accordions and button accordions) typically have right-hand buttons or keys that play single notes (melody) and left hand buttons that play chords and bass notes.
The bandoneon is a type of concertina particularly popular in South America and Lithuania, frequently featuring in tango ensembles." - (en.wikipedia.org 09.05.2020)
