 By 1992, Miriam Gauci was already a favourite in Vienna, Munich, Hamburg and Santa Fe.She has collaborated with Riccardo Muti ("Mefistofele" and Verdi's "Requiem" at the Salzburg Festival), Georges Pretre (Verdi's "Requiem"), Claudio Abbado ("Lohengrin" at La Scala), Frans Welser Most ("Don Carlo" in Cleveland), Aldo Ceccato, Gianluigi Gelmetti, Zubin Mehta ("Don Carlo" and Mahler's Symphonies), and in Verdi's Requiem at the Musikverein under the baton of Vladimir Fedoseyev.She performed in productions by Jean-Pierre Ponnelle ("La bohème" at the Dorothy Chandler’s Pavilion in Los Angeles in 1987 and Massenet's "Manon" at the Vienna State Opera in 1997), Dietrich Hillsdorf ("Don Carlo" at the Aalto Musiktheater of Essen in 1988), Steven Pimlott (Micaela in "Carmen" at Earl’s Court in London in 1989), Robert Carsen’s "Manon Lescaut" in Antwerp (1991) and Paris (1993) respectively, Robert Wilson (Cio-Cio San in Paris National Opera in 1994), Harry Kupfer (Suor Angelica at the Hamburg State Opera in 1995), Franco Zeffirelli ("La bohème" at the San Carlo of Naples in 1996), Pier’Alli ("Mefistofele" at the Vienna State Opera in 1998–2000), and Giorgio Strehler (Contessa in "Le nozze di Figaro" at the Teatro alla Scala of Milan in 2005).