Editing Concertina (section)

=== English and Duet concertinas ===
{{main article|English concertina|Duet concertina}}
The ''English concertina'' and the ''Duet concertina'' bear similarities in history and construction. Both systems generally play a [[chromatic scale]] and are unisonoric, with each key producing the same note whether the bellows are being pushed or pulled. Both of these English instruments are smaller than German concertinas, and are usually hexagonal in shape, though occasionally featuring 8, 10, or 12 sides. The English system alternates the notes of the scale between two hands, enabling rapid melodies. The duet system features the lower notes on the left, and higher notes on the right, facilitating the playing of interlaced harmonies and melodies.

The English concertina is credited to [[Sir Charles Wheatstone]], who first patented such a design in 1829 in [[Great Britain]]. Wheatstone was also the first to patent a duet concertina, in 1844.<ref name="Meyerbeer2002">{{cite book|author=Giacomo Meyerbeer|title=The Diaries of Giacomo Meyerbeer: The years of celebrity, 1850-1856|url=https://books.google.com/books?id=NyPsNbLpntEC&pg=PA138|date=1 January 2002|publisher=Fairleigh Dickinson Univ Press|isbn=978-0-8386-3844-6|pages=138–}}</ref>