Reduplication is a device found in all languages, seemingly, in which there is a repetition of a syllable. I learned about this with Doug Pulleyblank, my phonology professor at USC in 1986, whose passion for reduplication took him to Africa, so I hear. And there went my friend Uschi, for the same purpose. So, I learned that the future is formed in Tagalog, one of the languages in the Philipines, by repeating the first syllable. Thus, "sulat" means write and susulat means will write.
Brazilians are quite xenophobic. A study somewhere in the links of this blog shows this.; The Native-Brazilians live far and isolated. Brazilians adopt the term bizarre for anything they feel is alien to their culture.
So, the Tagalog example was considered bizarre. A little bit of research showed that it's present in English, as in willy-nilly, flegma-shmegma, hokey-pokey, Freaky Deaky; English must be a civilized language although its spelling is bizarre to me. However, had we changed our spelling, how many works in English would have become out of our reach today?
I found a great video of a Portuguese band playing Noel Rosa's "Gago Apaixonado." Theirs is a great chorinho played wtih Portuguese instruments, sung with a Portuguese from Portugal accent.
A gago is a stutterer. Get ahold of your favorite Brazilianist and have him/her check out the lyrics for you.