Piano accordion

Piano accordion (Fr.: accordéon-piano; It.: fisarmonica), accordion with piano-type keyboard, patented on Sept. 16, 1852, by Bouton of Paris. Models in use today have a keyboard compass of 2–4 octs. and a series of bass and chord buttons. One row of buttons produces bass tones, another row produces a series of chords. Large models have their bass buttons arranged in rows of 6 and can furnish major, minor, dominant 7th, and diminished 7th chords. Cf. harmoniflûte (151). Olson, Harry F. Musical…