A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It consists of expanding and contracting bellows, with buttons usually on both ends, unlike accordion but
Wheatstone English concertina, produced c. 1920
English concertina disassembled, showing bellows, reedpan and buttons
Hayden Duet Concertina
Chemnitzer concertina made by Star Mfg., Cicero, Illinois, USA in 2000
The harmonica, also known as a French harp or mouth organ, is a free reed wind instrument used worldwide in many musical genres, notably in blues, American folk music, classical music, jazz, country,
Concertina
…A concertina is a free-reed musical instrument, like the various accordions and the harmonica. It consists of expanding and contracting bellows, with buttons (or keys) usually on both ends, unlike accordion buttons, which are on the front. The…
A 16-hole chromatic (top) and 10-hole diatonic harmonica (bottom)
Comb and two reed plates
Reed plate
Reed plate mounted on the comb of a diatonic harmonica, one of several categories of harmonica