Petrobelli was a member of the editorial board of The Works of Giuseppe Verdi and an editor and member of the editorial board of the Edizione critica dell’epistolario verdiano.
In addition to Verdi, Petrobelli’s specialties included Tartini and Dallapiccola. His Music in the Theater: Essays on Verdi and Other Composers is a must-read book for all English-language Verdians.
His online vitae includes a list of his publications in PDF format.
Petrobelli was also named a Cavaliere di Verdi by the Club dei 27 of Parma.