She was also the Adalgisa (replacing the indisposed Fedora Barbieri) in the infamous Norma at Rome in 1958, when the performance was cancelled after Callas sang Act I and felt unable to continue; she kept the role partnering Anita Cerquetti, who replaced Callas for the remaining performances.
She appeared at the Teatro alla Scala in 1951, as Maffio Orsini in Lucrezia Borgia, opposite Caterina Mancini, Mirto Picchi, and Nicola Rossi Lemeni.
Another of Pirazzini's roles was of the Princesse de Bouillon in Adriana Lecouvreur, which she often sang with Magda Olivero in the title role, in Brescia (1956), Lisbon (1956), Palermo (1959) and Caracas (1961).
In 1962, her recording of Suzuki in Madama Butterfly won a Grammy Award.
She died in Rome on 25 December, 2016, at the age of 98.