Also, making his debut in the role, U.S. baritone Michael Chioldi, did so on a great level. Iago is a role that requires the greatest sinuosity. Verdi and Boito sought to create the essence of evil, both perfidious and subtle. Chioldi handled his powerful sonorous instrument with intelligence, shading his singing, and interpreting step by step the development of evil until the crowning moment of his “Credo en un Dio crude!”