The first escolas de samba or samba school to be formed was Mangueira, in 1928. Soon theme songs, elaborate costumes, and floats became the main attraction of the Rio Carnival. Many other teams from different communities in the Rio neighborhood followed Mangueira’s footsteps and formed samba schools to take part in the Carnival. The samba parade soon became the most popular event in Rio with the organizers being forced to set a time limit for each team in 1971. The streets of Rio remained the main stage for the Carnival until 1984, when the Sambadrome, built by world famous architect, Oscar Niemeyer, began to steal the thunder. Many of the current samba schools have their roots in the original schools of the 20’s and 30’s. Each school has had its success and failures as the years and the competitions have gone on. Some of the best-known samba schools are Unidos da Tijuca, Beija Flor, Salgueiro, Mangueira, Mocidade and Grande Rio.