Answer
Yes, Vittorio Gassman did perform in musicals. He made his musical debut in 1956 in the film "Buonanotte.. avvocato!" and went on to star in several other musicals throughout his career, including "C'eravamo tanto amati" (1974) and "Il padrone e l'operaio" (1975). Gassman's musical performances showcased his vocal talents and comedic timing, adding a new dimension to his acting repertoire.