German baritone Dietrich Fischer-Dieskau with Swiss soprano Lisa Della Casa, 23rd January 1965. The singers are appearing together in a production of Richard Strauss and Hugo von Hofmannsthal's 'Arabella' at Covent Garden, London. (Photo by Erich Auerbach/Hulton Archive/Getty Images)
Getty Images

Hulton Archive Erich Auerbach