Hans Knappertsbusch
At first, Reining worked as in a Viennese bank, and didn't commence her singing career until the age of 28, when she started to sing at the Vienna State Opera, mainly in soubrette roles. Two years later, she moved to Darmstadt, then to the Munich State Opera, where she made her debut as Elsa in "Lohengrin", under Hans Knappertsbusch. In 1937 she followed Knappertsbusch to the Vienna State Opera, where she sang Elsa again.