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Jazz accordion is a jazz practice that features the accordion—either piano accordion or chromatic button accordion—as a principal improvising and comping instrument. It adapts swing-time phrasing, bebop vocabulary, and modern jazz harmony to the bellows-driven mechanics of the accordion. The right hand typically carries melodic lines and solos, while the left hand provides bass motion and harmonic support, either via the traditional stradella bass system or a free-bass system that enables walking bass and rootless voicings. In European contexts the style often draws on musette waltzes and Parisian café idioms; elsewhere it readily blends with tango, Latin, and chamber-like small-group settings. The result ranges from fleet, guitar-like single‑note runs and elegant chord‑melody textures to luminous, reed‑choir timbres—capable of both lively swing and intimate, lyrical ballad playing.