Blocos are the street bands and groups that are the main popular expression in Rio de Janeiro Carnival in Brazil. These demonstrations are mixed under the term "street carnival", a term that still includes the bandstands and parades at Rio Branco Avenue, and happen during a period of about one month (beginning before and finishing after Carnival).
The biggest bloco is the Cordão do Bola Preta that attracts some 2,000,000 people to downtown Rio. The second biggest is Monobloco that attracts 80,000 people at Copacabana Beach.