Standardtänze
Ballroom tango, divided in recent decades into the "International" and "American" styles, has descended from the tango styles that developed when the tango first went abroad to Europe and North America. The dance was simplified, adapted to the preferences of conventional ballroom dancers, and incorporated into the repertoire used in International Ballroom dance competitions. English tango was first codified in October 1922, when it was proposed that it should only be danced to modern tunes, ideally at 30 bars per minute (i.e. 120 beats per minute – assuming a measure).