concertina (kŏnsûrtēˈnə) [key], 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 accordion, 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.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.