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During the next two decades, Foldi established himself as a character actor of the first rank in opera houses throughout Europe and the U.S., among them La Scala, Wiener Staatsoper, Zurich Opera, Glyndebourne Opera, Cincinnati Zoo Opera and Santa Fe Opera.
In the UK and Europe, the systems have been installed in venues including the Royal Opera House in London, the Teatro alla Scala and La Scala's Teatro degli Arcimboldi opera houses in Milan, Italy, the Gran Teatre del Liceu in Barcelona, Spain, and the Wiener Staatsoper in Wien, Austria.