)The 1955 cycle's "Siegfried" has not been released, though Brünnhilde appears only for that opera's final duet.The "Walküre" from this production, along with Keilberth's "Walküre" from 1954 (discussed below), represent the two occasions on which Mödl and her great contemporary Astrid Varnay sang the two leading women opposite one another; in this case, Mödl was Brünnhilde.