How's about we add Anthony Perkins to the list. Yes, the star of Psycho.
This was a very real, very legitimate musical, Greenwillow. The score was by Frank Loesser, who wrote Guys & Dolls and the Pulitzer Prize-winning How to Succeed in Business Without Really Trying. The story was quite pastoral, perhaps too pastoral for audiences, even in 1960, since the show only ran 97 performances.
(Fun Side Note: The musical was directed by George Roy Hill, who went on to direct the films Butch Cassidy and the Sundance Kid and The Sting.)
So, with all that out of the way now, this is "Never Will I Marry," sung by Anthony Perkins from Greenwillow. BUT -- as a bonus!
I was going to embed the audio from the original cast recording, but when I went looking for a graphic of the album cover (above), I discovered a video of Anthony Perkins re-creating the same song for a PBS special, Best of Broadway! It's introduced by Tom Bosley.