The bandoneón is a type of concertina particularly popular in Argentina and Uruguay which is an essential instrument in most tango ensembles from the traditional orquesta típicas of the 1930s and 1940s onwards. The bandoneón, so named by the German instrument dealer, Heinrich Band, was originally intended as an instrument for religious music and the popular music of the day, in contrast to its predecessor, the German concertina (or Konzertina), considered to be a folk instrument by some modern authors.