Samba
Although samba exists throughout Brazil – especially in the states of Bahia, Maranhão, Minas Gerais, and São Paulo – in the form of various popular rhythms and dances that originated from the regional batuque of the eastern Brazilian state of Bahia, a music form from Cape Verde, samba is frequently identified as a musical expression of urban Rio de Janeiro, where it developed during the first years of the 20th century. Early styles of samba - and specifically samba de roda - are traced back to the Recôncavo region of Bahia during the 17th century, and the informal dancing following a candomblé ceremony. It was in Rio de Janeiro that the dance practiced by former slaves who migrated from Bahia came into contact with and incorporated other genres played in the city (such as the polka, the maxixe, the lundu, and the xote), acquiring a completely unique character and creating the "samba carioca urbana" (samba school) and "carnavalesco" (Carnaval school director). Samba schools are large organizations of up to 5,000 people which compete annually in the Carnival with thematic floats, elaborate costumes, and original music.
Samba de Gafieira
The style originated from samba dancing in cabarets and "gafieiras" (hence the name, literally meaning "Samba of gafieira"), primarily in districts of Botafogo, Catete and Centro of Rio de Janeiro. The term gained recognition in 1940s. Over time the style significantly evolved away from the style 1940s under significant influence of Argentine Tango and incorporating many acrobatic elements. In modern codification of the dance, acrobatic elements and the ones not characteristic to Brazilian culture are excluded from the syllabus. They cannot be used in dance competitions, but still can be used as embellishments in the show version of the dance ("Samba de Gafieira de show").