Button accordion

A button accordion is a type of accordion on which the melody-side keyboard consists of a series of buttons. This differs from the piano accordion, which has piano-style keys. Erich von Hornbostel and Curt Sachs categorize it as a free reed aerophone in their classification of instruments, published in 1914.^[1] The sound from the instrument is produced by the vibration of air in reeds.^[1] Button accordions of various types are particularly common in European countries and countries where European people settled. The button accordion is often confused with the concertina;^[2] the button accordion's buttons are on the front of the instrument, where as the concertina's are on the sides and pushed in parallel with the bellows.