Tango is a style of music in or time that originated among European and African immigrant populations of Argentina and Uruguay (collectively, the "Rioplatenses"). It is traditionally played on a solo guitar, guitar duo, or an ensemble, known as the orquesta típica, which includes at least two violins, flute, piano, double bass, and at least two bandoneóns. Sometimes guitars and a clarinet join the ensemble. Tango may be purely instrumental or may include a vocalist. Tango music and dance have become popular throughout the world.
Even though present forms of tango developed in Argentina and Uruguay from the mid-19th century, there are records of 19th and early 20th-century tango styles in Cuba and Spain, while there is a flamenco tango dance that may share a common ancestor in a minuet-style European dance. All sources stress the influence of African communities and their rhythms, while the instruments and techniques brought in by European immigrants in the 20th century played a major role in the style's final definition, relating it to the salon music styles to which tango would contribute back at a later stage.
Angel Villoldo's 1903 tango "El Choclo" was first recorded no later than 1906 in Philadelphia. Villoldo himself recorded it in Paris (possibly in April 1908, with the Orchestre Tzigane du Restaurant du Rat Mort), as there were no recording studios in Argentina at the time.
Early tango was played by immigrants in Buenos Aires and Montevideo. The first generation of tango players from Buenos Aires was called "Guardia Vieja" (the Old Guard). It took time to move into wider circles; in the early 20th century, it was the favorite music of thugs and gangsters who visited brothels, in a city with 100,000 more men than women (in 1914). The complex dances that arose from such rich music reflect how the men would practice the dance in groups, demonstrating male sexuality and causing a blending of emotion and aggressiveness. The music was played on portable instruments: flute, guitar, and violin trios, with bandoneón arriving at the end of the 19th century.