Actually, the group's origins aren't such a mystery; they're explained in some detail on the band's website. Sambodromo originated in 1993 as a high-school percussion ensemble, and eventually evolved into the bateria-backed pop/rock band heard on this 2003 album.
This song is a response to the 9-11 attacks and counter-attacks, and its lyrics examine revenge, lies, moral certainty, and the need to "get the dust out of our blinded eyes." All with singing cuica, funky guitar, and their trademark percussion. A message you can dance to, and one that hasn't grown less relevant in the four years since it was recorded.
from the album Abfahrt!