Sixty couples from around the world competed in Buenos Aires over the weekend to get into the finals of the Tango World Championship. The best 20 who pass Sunday's semifinals will have the opportunity to show their movements at the finals on August 22 at the emblematic Luna Park stadium of Buenos Aires. Said to have began in the 19th century at Buenos Aires brothels, tango was initially performed by pairs of men. The tournament is part of Argentina's International Tango Festival and Championship