Nyorera kupfuurira kweiyi ndima - Mukupera kwema1950, Varviso akaita nhamba kana mukurumbira wekutungamira kwekutanga, kusanganisira Deutsche Oper Berlin (1958), Paris Opera (1958), uye San Francisco Opera (1959), yekupedzisira iri basa rake rekutanga rekutungamira muUnited States. Muna 1958 akatungamirira kutanga kwenyika kwaHeinrich Sutermeister's "" paBrussels World Fair
. 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".