Donald John Gramm was an American bass-baritone whose career was divided between opera and concert performances. His appearances were primarily limited to the United States, which at the time was unusual for an American singer. John Rockwell of The New York Times described Gramm as follows: "He had an unusually rich, noble tone, and although its volume may not have been large, it penetrated even the biggest theaters easily. Technically, he could handle bel-canto ornamentation fluently. But his real strengths lay in his aristocratic musicianship and his instinctive acting." Among the most notable of his many operatic roles were the title role in Verdi's Falstaff, Leporello in Mozart's Don Giovanni, and Dr. Schön and Jack the Ripper in Berg's Lulu.

Falstaff is a comic opera in three acts by the Italian composer Giuseppe Verdi. The Italian-language libretto was adapted by Arrigo Boito from the play The Merry Wives of Windsor and scenes from Henry IV, Part 1 and Part 2, by William Shakespeare. The work premiered on 9 February 1893 at La Scala, Milan.