Bandoneon Day, observed in Argentina every July 11, celebrates the bandoneon, a musical instrument integral to tango music. This holiday commemorates the birth anniversary of Anibal Troilo, a prominent tango performer and bandleader who significantly contributed to the genre during its Golden Age from 1935 to 1952. The bandoneon, created by German instrument dealer Heinrich Band, was brought to Argentina by German and Italian emigrants in the late 19th century and quickly became essential in tango ensembles. The celebration was first initiated in Buenos Aires in 2000 and was later legalized nationwide by the Congress of the Argentine Nation in 2005. Key figures in the establishment of this holiday include Troilo’s grandson Francisco Torne and Horacio Ferrer, president of the National Academy of Tango.