Out of my curiosity: what exactly are differences between various forms of colloquial language in various parts of Brazil? What are differences between them in pronunciation and grammar? For example what is typical for pronunciation in the state Parana and how it is different from the variant spoken in Pernambuco? And what is different for pronunciation in Sao Paulo and how it is different from the pronunciation in Rio Grande do Sul or Minas Gerais? Is the colloquial speech in the Brazilian South influenced by languages of immigrants who came there in the late 19th and 20th century (Italian, German, Spanish, Japanese)? What are influences of African and Indian languages on colloquial Brazilian Portuguese in the Northeast, North and other parts of Brazil? I listen to plenty of Brazilian music (Gilberto Gil, Ivete Sangalo, Caetano Veloso, Daniela Mercury, Carlinhos Brown, João Gilberto), but the singers are usually from the state Bahia so I am not very familiar with another variants of Brazilian Portuguese.