the first official samba-school contest happened in 1929, with only three groups, and "Oswaldo Cruz" group won the competition, with a samba written by Heitor dos Prazeres. GRES Estação Primeira de Mangueira Samba-School, represented by Cartola, and Estácio de Sá samba School, represented by Ismael Silva, were the other 2 contestants. Eventually, "Oswaldo Cruz" became Portela Samba School, the greatest winner of Rio's Carnival with 22 Titles. Although many Brazilians tend now to favor other forms of national music culture to that of Rio's samba schools, the carnival of Rio de Janeiro remains the national festival par excellence, and the samba of Rio de Janeiro continues to be an agent of national unification. Carnaval blocos, also known as Blocos de Rua ("Street Blocks") occur in nearly every neighborhood throughout the city and metropolitan areas, but the most famous are the ones in Copacabana, Ipanema, Leblon, Lagoa, Jardim Botânico, and in downtown Rio. Organizers often compose their own music themes that are added to the performance and singing of classic "marchinhas" and samba popular songs. "Cordão do bola preta" ("Polka Dot Bloco"), that goes through the heart of Rio's historical center, and "Suvaco do Cristo" ('Armpit of Christ the Redeemer', referring to the angle of the statue seen from the neighborhood), near the Botanical Garden, are some of the most famous groups. Monobloco has become so famous that it plays all year round at parties and small concerts. The formalized samba schools are very small groups of performers, financed by respected organizations (as well as legal gambling groups), who work year-round in preparation for Carnival. Samba Schools perform in the Sambadrome, which runs four entire nights and is overseen by LIESA. They are part of an official competition, divided into seven divisions, in which a single school is declared the winner, according to ten judging categories that include costume, flow, theme, and band music quality and performance. Some samba schools also hold street parties in their neighborhoods, through which they parade along with their followers. All performers at the Sambadrome have to wear a costume. Some honored members of the school or community may receive one for free, but normally, most will have to pay for their own. Tourists can have the same experience on the "Commercial Area" of some Samba Schools but need to buy their own costume from the school, or through an agent, either of which can be