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.
Rhumba
Although the term "rhumba" began to be used by American record companies to label all kinds of Latin music between 1913 and 1915, the history of rhumba as a specific form of ballroom music can be traced back to May 1930, when Don Azpiazú and his Havana Casino Orchestra recorded their song "El manisero" (The Peanut Vendor) in New York City. This single, released four months later by Victor, became a hit, becoming the first Latin song to sell 1 million copies in the United States. The song, composed by Moisés Simons, is a son-pregón arranged, in this case, for Azpiazú's big band featuring 3 saxophones, 2 cornets, banjo, guitar, piano, violin, bass, and trap drums. With vocals by Antonio Machín and a trumpet solo (the first one in the recorded history of Cuban music) by Remberto Lara, the recording (arranged by saxophonist Alfredo Brito) attempted to adapt the Cuban son to the style of ballroom music prevalent at the time in the East Coast.