accordion, piano accordion, squeeze box - a portable box-shaped free-reed instrument; the reeds are made to vibrate by air from the bellows controlled by the player

keyboard - device consisting of a set of keys on a piano or organ or typewriter or typesetting machine or computer or the like

pipe organ, organ - wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard

forte-piano, piano, pianoforte - a stringed instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds