Tango is a style of music that originate among European immigrant populations of Argentina and Uruguay. It is traditionally played by a sextet, known as the orquesta típica, which includes two violins, piano, doublebass, and two bandoneons. Earlier forms of this ensemble sometimes included flute, clarinet and guitar. Tango music may be purely instrumental or may include a vocalist. Tango music is well-known across much of the world, along with the associated tango dance.