"Big Star" episode
The episode features Clay Shannon as a singing boyfriend of Mary's.
But his voice is dubbed!
AND - it sounds like Gordon McCrae did the dubbing!
That singing is unmistakable: it's the same one singing "Oh What a Beautiful Morning" in "Oklahoma."
Furthermore, the vocal quality of the songs - and Clay's dubbed voice - have a like a conventional "nice boy" quality.
Seeing that Clay had a long career on Broadway, it would seem that it wasn't Clay's actual voice that was the problem, but, rather, does Clay have a Southern accent/twang?
I'm thinking that the original intent of having Clay as Mary's singing boyfriend was to cash in on the "Elvis" craze, and Clay more than likely came off as an Elvis-wannabee, particularly if he sang like Elvis and spoke with a Southern accent. Consider the song selections - "Red River Valley" etc - those are all folk songs with some Southern connection.
Then, for whatever reason, the decision was made to completely avoid any Elvis connection - and Gordon's voice was called to duty.
The end-result is a neither homegrown Elvis nor (then)contemporary rock-and-roll, but, instead, a musical theater experience. NOT what Mary would presumably enjoy!
"Don't call me 'honey', mac."
"Don't call me 'mac'... HONEY!"