Editing Accordion (section)

===Unusual accordions===
Various hybrid accordions have been created between instruments of different buttonboards and actions. Many remain curiosities – only a few have remained in use:
* The [[Schrammel accordion]], used in [[Vienna|Viennese]] [[chamber music]] and [[klezmer]], which has the treble buttonboard of a chromatic button accordion and a bisonoric bass buttonboard, similar to an expanded diatonic button accordion
* The [[Steirische Harmonika]], a type of bisonoric diatonic button accordion particular to the Alpine folk music of Slovenia, Austria, the Czech Republic, the German state of Bavaria, and the Italian South Tyrol
* The [[schwyzerörgeli]] or Swiss organ, which usually has a three-row diatonic treble and 18 unisonoric bass buttons in a bass/chord arrangement –  a subset of the Stradella system in reverse order like the Belgian bass – that travel parallel to the bellows motion
* The [[trikitixa]] of the [[Basque people]], which has a two-row diatonic, bisonoric treble and a 12-button diatonic unisonoric bass
* The British chromatic accordion, the favoured diatonic accordion in Scotland. While the right hand is bisonoric, the left hand follows the Stradella system. The elite form of this instrument is generally considered the German manufactured Shand Morino, produced by [[Hohner]] with the input of [[Jimmy Shand|Sir Jimmy Shand]]<ref>{{cite book |first=Rob |last=Howard |date=2003 |title=An A to Z of the Accordion and related instruments |location=Stockport |publisher=Robaccord Publications |isbn=978-0-9546711-0-5}}</ref>
* ''Pedal harmony'', a type of accordion used sometimes in Polish folk music, which has a pair of [[pump organ]]-like bellows attached.
* The [[Finland|Finnish]] composer and accordionist Veli Kujala developed a ''[[quarter tone]] accordion'' together with the [[Italy|Italian]] accordion manufacturer Pigini in [[2005]], and has written works for it. It deploys the same system as the concert accordion, with a scale of five octaves, each divided into 24 quarter tones.<ref>{{Cite web|url=https://fmq.fi/articles/notes-letters-column-a-wonderworld-of-quarter-tones|title=Notes & Letters column: A wonderworld of quarter-tones|date=21 August 2017|website=Fmq.fi|access-date=22 April 2021}}</ref> Other notable composers who have written [[concerto]]s for the quarter tone accordion include [[Jukka Tiensuu]] and [[Sampo Haapamäki]].<ref>{{Cite web|url=https://velikujala.com/concertos/|title=Concertos|website=Velikujala.com|date=10 September 2017 |access-date=22 April 2021}}</ref>