Current sound clips:

Ich habe keine guten Nächte (Klytämnestra, Elektra, Strauss; studio recording with piano, June 2011)

Condotta ell'era in ceppi (Azucena, Il trovatore, Verdi; studio recording with piano, June 2011)

Dopo notte (reprise; from Handel's Ariodante; with harpsichord, studio recording, 2008)

La chevelure (Debussy,the second of Les chansons de Bilitis; with piano; studio recording, 2008)

Re dell'abisso (Ulrica in Verdi's Un ballo in maschera; with orchestra, studio recording, 2008)

Cury mury fuk (Ježibaba's aria from Dvorak's Rusalka; live in concert with piano, December 2008)

The Enchantress (J. L. Hatton; live in concert with piano, December 2008)

Grausamer!  (Kundry, Parsifal, Wagner; studio recording with piano, June 2011)

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A very short video of Katherine as Lady Macbeth in Sciarrino's Macbeth can be seen here. This is the start of the "mad scene" (in Shakespeare, the sleepwalking scene), and corresponds to "Yet here's a spot; out damned spot".