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In the 1840s , a man named Heinrich Band sold music in Krefeld , a town in Germany . There he sold a new instrument . It was square , and it had many buttons . You push it and pull it , and it sings . Some people say it was made for church music . Band did not build the instruments himself . He bought them from other makers and sold them . Later , the instrument took his name . It is called the bandoneon . Maybe the name comes from " Band Union , " but we are not sure . Then the instrument went far away . Around 1870 , it probably crossed the sea with German sailors and other people from Germany . Nobody knows exactly how . It came to Argentina and Uruguay . There , in Buenos Aires and Montevideo , people danced the tango . The poor neighbourhoods of these two cities made the tango . The bandoneon became the main sound of the music . Its sound is deep and full of feeling . In 2009 , UNESCO listed the tango as heritage of Argentina and Uruguay together . Today a small German instrument plays one of the world 's best - known dances . Its sound still crosses the sea . 
