![]() On the chromatic side are English concertinas, button chromatics, piano accordions and chromatic bandoneons. On the diatonic side of the family are Anglo concertinas, Chemnitz concertinas, button diatonics and bandeoneons. The family is divided into two preliminary halves: "Diatonic" accordions play different pitches when bellows are expanded or compressed "chromatic" accordions sound the same pitch in both bellows directions. Characteristics of all accordions include: (1) metal reed-tongues stimulated by air turbulence (2) axial alignment to the player's body of one or more mechanical keyboards manipulate by the fingers to select pitches (3) folded bellows that induce air-flow through the instrument, move horizontally, and are controlled by arm-pressures that in turn regulate the loudness of the sound emitted (4) straps that hold the instrument in the hands or to the shoulders (5) encasements that are commonly recognized (6) ease of portability. The term 'accordion' is the proper generic term for all members of this complex family of free-reed aerophones. A World of Accordions Museum, Superior, Wisconsin USAĪ World of Accordions Museum houses, displays and restores accordion family instruments, their relatives and predecessors.
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