As early as 1947, the Mozart-Ensemble was playing guest performances at the Royal Opera House in London, with Mozart's "Don Giovanni". Richard Tauber, who had fled from the Nazis, sang "Don Ottavio"; three months later he died, and was remembered for singing with "half a lung" in order to fulfil his dream, many other artists became associated with the Mozart-Ensemble, for example Karl Böhm, but their role was still greatly peripheral, in a straightforward or assisting role. This was the beginning of Krips' worldwide career, which would take him to the most prominent houses in the world. Until his death in 1974, Krips was regarded as one of the most important "Maestri" (conductors/music directors) of the Staatsoper.