Verdi's Attila, his ninth opera, had its premiere at Venice's Teatro La Fenice in March 1846. Based on the German play Attila, King of the Huns, the libretto has its own storied history: as Verdi fell seriously ill before the work's completion, the main librettist moved permanently to Madrid, leaving the last act of Attila only a sketch. It was then that Verdi called upon Francesco Maria Piave, the librettist for two of his earlier works, who at the composer's behest scratched plans for a large choral finale and decided instead to concentrate on the dramatic roles of...