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In page Waltraud Meier:

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During the 1990s, Meier also moved into roles within the dramatic soprano repertoire. Between 1993 and 1999, she appeared at Bayreuth as Isolde in Tristan und Isolde staged by Heiner Müller and conducted by Daniel Barenboim. In 1998 she added additional dramatic soprano roles, debuting as Leonore in Fidelio with the Chicago Symphony Orchestra, again under the direction of Barenboim, and also appearing as Ortrud in a new Lohengrin production at the Bavarian State Opera.[citation needed]