Pedzisa mutsara unotevera: Mukupera kwema1950 Varviso akaita nhamba kana kuti anozivikanwa mutungamiri anotungamira kutanga, kusanganisira Deutsche Oper Berlin (1958), Paris Opera (1958), uye San Francisco Opera (1959), iyo yekupedzisira iri basa rake rokutanga rokutungamirira muUnited States. Muna 1958 akatungamirira kuratidzwa kwenyika yokutanga yaHeinrich Sutermeister's "" pa
Musangano Wenyika Yose weBrussels. Musi wa10 Gumiguru 1961 akadzokera kuSan Francisco kunotungamira kuratidzwa kweUnited States kweBritten's "A Midsummer Night's Dream". Akatungamirira "The Marriage of Figaro" nokuda kwokutanga kwake kuGlyndebourne Festival muna 1962 yakateverwa nekugadzirwa kwe "Der Rosenkavalier" nokuda kwekutanga kwake neCovent Garden gare gare gore iroro. Akadzokera kakawanda kuRoyal Opera kwoupenyu hwake hwose, achitungamirira repertoire yakakura iyo yakatanga kubva pamabasa akaenzana naMozart, Puccini, Strauss, naWagner, kune maopera anowanzoitwa seDebussy's "Pelléas et Mélisande".