Renowned vocal coach who takes Mary under his wing, demanding absolute control over her career in exchange for stardom. He helps her conquer stage fright, later clashes with her desire for independence, temporarily replaces her with Lally, proposes to her, and attends her Met debut from the prompter's box.
Giulio serves as Mary's vocal coach and career architect, demanding absolute professional control.
Lally harbors unrequited feelings for Giulio, which fuels her rivalry with Mary.
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