A significant early milestone in her studies was work with Elisabeth Schwarzkopf in master classes in Carmel Valley, California in 1982.
Her Metropolitan Opera, debut was in the title role of Alban Berg's Lulu, and she returned there in 2008 for the Queen of the Night in Die Zauberflöte.
With a great sympathy for the works of Richard Strauss, she often performs Zerbinetta in Ariadne auf Naxos (Munich, Japan, Vienna), Sophie in Der Rosenkavalier (Paris Châtelet) and Aminta in Die schweigsame Frau (Palermo).
Among her collaborators have been Christoph Eschenbach, John Eliot Gardiner, Nikolaus Harnoncourt, James Levine, Nicholas McGegan, Roger Norrington, Wolfgang Sawallisch, Pinchas Steinberg and Esa-Pekka Salonen.
Label: Archiv Produktion (DG) Composer: Wolfgang Amadeus Mozart Performers: Gardiner, Oelze, Schade, Sieden Conductor: John Eliot Gardiner Orchestra/Ensemble: English Baroque Soloists, Monteverdi Choir Label: Archiv Produktion (DG) Composer: Wolfgang Amadeus Mozart Performers: Olsen, Orgonasova, Sieden, Peper Conductor: John Eliot Gardiner Orchestra/Ensemble: English Baroque Soloists, Monteverdi Choir Label: Glossa Composer: Wolfgang Amadeus Mozart Performer: Cyndia Sieden Conductor: Frans Brüggen Orchestra/Ensemble: Orchestra of the 18th Century Label: Berlin Classics Composer: Anton Schweitzer Performers: Hofstetter, Genz, Schneider, Sieden Conductor: Michael Hofstetter Orchestra/Ensemble: Concerto Cologne Label: Orfeo Composer: Wolfgang Amadeus Mozart Performers: Ford, Sieden, Oelze Conductor: Roger Norrington Orchestra/Ensemble: Camerata Salzburg Label: Telarc Composer: Wolfgang Amadeus Mozart Performers: Pearlman, Aler, Sieden Conductor: Martin Pearlman Orchestra/Ensemble: Boston Baroque Label: Philips Composer: Christoph W. Gluck Performers: Ragin, McNair, Sieden Conductor: John Eliot Gardiner Orchestra/Ensemble: English Baroque Soloists Label: EMI Angel Composer: Richard Strauss Performers: Kollo, Studer, Schwarz, Vinzing, Muff, Sieden Conductor: Wolfgang Sawallisch Orchestra: Symphonie-Orchester des Bayerischen Rundfunks Label: Koch Composer: Richard Strauss Performers: Kurt Moll, Van Der Walt, Sieden Conductor: Pinchas Steinberg Orchestra: Munich Radio Orchestra