I asked a friend to show me how to play "Dia Mau" from "Ornatos Violeta", since there 
a tab for it, and Ornatos is one of the best portuguese bands ever in my opinion.I decided 
tab it and here it is:

INTRO:
Guitar:

e|------------------|------------------|
B|------------------|------------------|
G|-7-7-7-77---------|-8-8-8-88---------|
D|-7-7-7-77-8-8-8-88|-8-8-8-88-7-7-7-77|
A|-5-5-5-55-8-8-8-88|-6-6-6-66-7-7-7-77|
E|----------6-6-6-66|----------5-5-5-55|

You'll easily get the strumming pattern if you hear the song itself.

In the next part, they probably use a Synthesizer.

Tabbed by JoaoB
Arranged by Ricardo