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Bellows-driven free-reed aerophone musical instruments For other uses, see Accordion (disambiguation). Accordion A piano accordion (top) and a button accordion (bottom) Keyboard instrument Hornbostel–Sachs classification 412.132 (Free-reed aerophone) Developed Early 20th century Playing range Depends on configuration: Left-hand manual Chromatic button accordion Diatonic button accordion Piano accordion Left-hand manual Stradella bass system Free-bass system Related instruments Hand-pumped: Bandoneon, concertina, flutina, garmon, trikitixa, Indian harmonium Foot-pumped: Harmonium, reed organ Mouth-blown: Claviola, melodica, harmonica, Laotian khene, Chinese shēng, Japanese shō Electronic reedless instruments: Electronium, MIDI accordion, Roland Virtual Accordion Musicians Accordionists (list of accordionists). More articles Accordion, Chromatic button accordion, Bayan, Diatonic button accordion, Piano accordion, Stradella ba...