Verona Arena
As a guest, he conducted in 1960 at the Royal Opera House, at the Vienna State Opera and the Salzburg Festival. He had a contract with the Metropolitan Opera in New York City from 1962 when he made his debut with Verdi's "Un ballo in maschera". He conducted more than 400 performances at the house. He conducted at many more opera houses all over the world including the Verona Arena.