The Watch Duet 

Valerie Masterson and John Brecknock in the Act 2 duet for Gabriel von Eisenstein and his wife Rosalinda (disguised as an Hungarian Countess) from the Strauss operetta 'Die Fledermaus'.
BBC Concert Orchestra
Conducted by Vilem Tausky
This performance was part of a BBC Radio concert with the slightly unlikely title: 'Viennese Night from Scarborough'
Broadcast: 3rd May 1975
Here is another example of the magical way these two singers matched each other so well whilst projecting the text with equal clarity and inhabiting the characters they are playing.