A bandoneonist is a musician who plays the bandoneon, a type of concertina that is particularly popular in Argentine tango music. The instrument has a unique sound, produced by pushing and pulling bellows while pressing buttons to create different notes. Bandoneonists often perform in tango ensembles, contributing to the rich, emotional sound that characterizes this genre. The bandoneon was originally developed in Germany in the 19th century but found its most significant expression in Argentina. Notable bandoneonists, such as Astor Piazzolla, have helped elevate the instrument's status, blending traditional tango with jazz and classical influences.