he made her la scala debut in 1951. other debuts were at the salzburg festival as desdemona in "otello" in 1952 under the direction of wilhelm furtwängler, san francisco as mimi in "la bohème" in 1954, the lyric opera of chicago as marguerite in "faust" in 1955, the verona arena as mimi in 1958, covent garden as "tosca" in 1960, paris opera in 1961 as violetta in "la traviata".