With a voice described variously as "oaken," "solid," and "sonorous," Bonaldo Giaiotti spent a quarter century as a reliable artist at the Metropolitan Opera. Elsewhere, too, his firm, handsome basso cantante was deployed most often in static roles: high priests, fathers, and characters whose function is as much ceremonial as dramatic. His voice recorded well and he was often engaged for important studio assignments. He survived a misdiagnosis regarding the condition of his vocal chords that might have impaired or even ended his career to reformulate his voice production and c...