The singer is based on a mixture of real-life crooners ranging from Johnny Mathis to Nat “King” Cole to Harry Belafonte. "He's kind of an amalgamation of a lot of different figures who were that successful, but Johnny Mathis comes to mind," Rachel Brosnahan told Refinery29. It turns out the character is a combination of performers in reality as well. Baldwin is played by McClain, but when it comes to his soaring singing voice, that can be credited to Broadway singer, Darius de Haas. de Haas first began performing the singing voice of Baldwin in season 2, when Miriam Maisel first crossed paths with her future tour headliner