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.
Rumba
"Rumba" entered the English lexicon in the early 20th century, at least as early as 1919, and by 1932 it was used a verb to denote the ballroom dance. In this sense, the anglicised spelling "rhumba" became prevalent and is now recommended to distinguish it from traditional Cuban rumba. Also in the first third of the 20th century, "rumba" entered the Spanish flamenco world as a fast-paced "palo" (style) inspired in the Cuban guaracha, and which gave rise to other forms of urban music now known as "rumba". Throughout Latin America, "rumba" acquired different connotations, mostly referring to Cubanized, danceable, local styles, such as Colombian "rumba criolla" (creole rumba). At the same time, "rumba" began to be used a catch-all term for Afro-Cuban music in most African countries, later giving rise to re-Africanized Cuban-based styles such as Congolese rumba.