Fado, the elegant Portuguese song form that is enjoying a great renewal, was never quite as rigid as it appears. Its austere setup, with a singer backed only by acoustic guitars, and its constant reverence for fadistas of the past conceal its openness to new ideas. Amália Rodrigues herself — fado’s central figure in the 20th century — made fado out of music of other countries. Her successors today look to rock and other sources, even as they cultivate the classic songbook and esthetic.
Ana Moura, who visits the Berklee Performance Center on Saturday, is one of the latest singers to come out of the Lisbon taverns where fado’s essence resides and become one of its global ambassadors. She embodies, at a high level, modern fado’s duality: Her potent contralto and her traditional fado treatments have earned her Amália comparisons at home — the ultimate connoisseur’s praise. But she has also shared the stage with the Rolling Stones, and one of her big fans is Prince.