If the criteria is 'what we hear on the cast albums,' then Dean Jones certainly does qualify. I would also suggest Tony Perkins for Greenwillow, Larry Blyden (The Apple Tree), Robert Rounseville (Candide & Street Scene), Vincent Price (Darling of the Day), Ezio Pinza (Fanny), Biff McGuire (Finian's Rainbow - 1960 revival), Farley Granger (no one got a nomination for First Impressions), Jose Ferrer (The Girl Who Came to Supper), Peter Palmer (L'il Abner), Bill Hayes (Me & Juliet - what a voice!), Robert Horton & Stephan Douglass (110 in the Shade), John Raitt (The Pajama Game), David Wayne (Say, Darling), Raul Julia (Threepenny Opera - 1976 revival), and, although listed below the title, Keith Andes for Wildcat! All these just from musicals in the Sony/RCA catalog.