Nilsson, Birgit (1918-2005), was a celebrated Swedish dramatic soprano. She became noted for the power and clarity of her voice. Critics generally regard Nilsson as one of the finest singers of heroic roles in the operas of Richard Wagner. Her performances as the Wagnerian heroines Isolde and Brunnhilde set the standard for her time. Nilsson also achieved fame in the roles of Aida, Lady Macbeth, Salome, and Tosca. However, a large number of critics rate Nilsson's performance in the title role of Giacomo Puccini's Turandot as her outstanding achievement. Nilsson's recordings are considered masterpieces of dramatic soprano singing.