[4][1] She continued graduate studies at the Juilliard Opera Center with whom she performed in the United States premieres of Francesco Cavalli's Ormindo (as Nerillo in 1968[5]) and Arthur Honegger's Antigone.
[4] Bruno made her professional opera debut in 1968 as Monica in Menotti's The Medium at the Festival dei Due Mondi in Spoleto, Italy.
[7] Other roles she sang with the SFO include Anna Truelove in Igor Stravinsky's The Rake's Progress (1970);[8] Pamina in Mozart's The Magic Flute (1971);[9] Mimì in Puccini's La bohème (1973);[10] Despina in Mozart's Così fan tutte (1975)[11] and Micaëla in Bizet's Carmen (1975)[12] She later returned to the SFO in 2004 to portray the maidservant in Giuseppe Verdi's Simon Boccanegra.
[19] In Europe, Bruno performed in several productions with the Dutch National Opera in 1970s, including portrayals of Mimì (1970),[20] Anna Truelove in The Rake's Progress (1972)[21] and Nanetta in Giuseppe Verdi's Falstaff (1972, 1973).
[23] She also performed in many productions with the Scottish Opera, appearing as Mimì (1974, 1976); Desdemona in Giuseppe Verdi's Otello (1976, 1977), and Cio-Cio-San in Puccini's Madama Butterfly (1976, 1978).
[3] She performed the role of Mussetta in Puccini's La bohème at the Palais Garnier for the Paris Opera in 1973 and 1974 with conductor Aldo Ceccato and Robert Kerns as her Marcello.