Deolinda

Deolinda is a Portuguese quartet band founded in 2006 when brothers Pedro da Silva Martins and Luis José Martins (formerly of the band 7-Headed Beast) invited their cousin, Ana Bacalhau, who was then singing with the band Lupanar, to sing four songs they had written. When they realized that her voice perfectly fit their songs they invited her to join them. They also invited José Pedro Leitão, the bass player with Lupanar and currently Ana Bacalhau's husband, to join them—creating Deolinda.

source: Wikipedia