With Roots in Africa, the berimbau is the single stringed instrument
now associated with the Afro-Brazilian Martial art of Capoeira.
This video excerpt from Mestre Amen's DVD gives a good glimpse of
what correct technique looks like.
"Here is a good primer article on the
berimbau by Tadeu Batista
From Capoeiranyc.com Berimbau
sound samples of the capoeira rhythms and what they mean
good berimbau article by N.Scott Robinson and Richard Graham.
It focuses not only on the historical development and traditional
use of berimbau in Brazil but also on its subsequent technical and
timbral development in popular musics. he details electric berimbau,
double-string berimbau, and all kinds of new uses of the instrument.