He later sang most of the great Verdi baritone roles, including Rigoletto, Count De Luna in Il trovatore, Giorgio Germont in La traviata, Marquis of Posa in Don Carlos, and Amonasro in Aida.

[3] He was a regular guest at the Vienna State Opera, where he first appeared in 1956 as Enrico in Lucia di Lammermoor in a performance from La Scala with Maria Callas in the title role.

[6] Panerai often partnered in recordings as on stage with Maria Callas and Giuseppe Di Stefano, as in Il trovatore,[1] Mascagni's Cavalleria rusticana with him as Alfio, Leoncavallo's Pagliacci (singing Silvio), Bellini's I puritani and Puccini's La bohème.

[1] He played Ford in three different recordings of Falstaff, with three different singers of the title role (Tito Gobbi, Dietrich Fischer-Dieskau, and Giuseppe Taddei), the latter on video, with Herbert von Karajan conducting.

[4] He sang Wagner in Italian translation, as Amfortas in a 1950 recorded performance of Parsifal with Callas as Kundry and Boris Christoff as Gurnemanz.