bᵻtwˌiːn nˈaɪntiːnhˈʌndɹɪd twˈɛnti fˈaɪv ænd nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈoːɹ, hiː wʌz ɛŋɡˈeɪdʒd tə sˈɪŋ ɹˈɛɡjʊlɚli ɪn bɜːlˈɪn mˈoʊst sɪɡnˈɪfɪkəntli æt ðə bɜːlˈɪn stˈeɪt ˈɑːpɚɹə ænd æt sˈɛvɹəl ˈʌðɚ lˈiːdɪŋ ˈɑːpɚɹə vˈɛnjuːz ɪn dʒˈɜːməni ænd ˈɔːstɹiə.
Between 1925 and 1944, he was engaged to sing regularly in Berlin (most significantly at the Berlin State Opera) and at several other leading opera venues in Germany and Austria.