Chord organ
Electronic organ / From Wikipedia, the free encyclopedia
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Chord organ is a kind of home organ that has a single short keyboard and a set of chord buttons, enabling the musician to play a melody or lead with one hand and accompanying chords with the other, like the accordion with a set of chord buttons which was originated from a patent by Cyrill Demian in 1829, etc.[1][2] (See Accordion#History [note 1])
Initially, the chord organ was invented as a kind of electronic home organ by Laurens Hammond in 1950.[3][4][5] This was followed by the reed chord organ (c. 1959) and Optigan (c. 1971). The sound of the reed chord organ is somewhat similar to the harmonium or the accordion.