bandoneon

noun

1. A small Latin American accordion played with buttons which is frequently used in tango ensembles.

   “Piazzolla studied piano in New York with Rachmaninoff and went to France to study with Nadia Boulanger, but his first and favorite instrument was the bandoneon, an accordion-like instrument invented in 1854 by Heinrich Band that has a series of buttons instead of piano keys.”

   “Created as an aggressive dance, expressing the dancers’ sexual instincts more than their feelings, and with the addition of the bandoneon as a predominant musical instrument, the tango acquired its characteristic, definitive rhythm and sound.”